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Finding the Fourth Proportional to 640,871,998.40, 961,307,997.60 and 425,461,246.40

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Solution

The fourth proportional to 640,871,998.40, 961,307,997.60 and 425,461,246.40 is: 638,191,869.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,871,998.40 : 961,307,997.60 = 425,461,246.40 : x
  2. Step 2: Convert to fraction form
    640,871,998.40/961,307,997.60 = 425,461,246.40/x
  3. Step 3: Cross multiply
    640,871,998.40x = 961,307,997.60 × 425,461,246.40
  4. Step 4: Simplify right side
    640,871,998.40x = 408,999,298,833,184,192
  5. Step 5: Solve for x
    x = 408,999,298,833,184,192/640,871,998.40
  6. Step 6: Final answer
    x = 638,191,869.60

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.