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Finding the Fourth Proportional to 611,998.40, 917,997.60 and 212,506.40

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Solution

The fourth proportional to 611,998.40, 917,997.60 and 212,506.40 is: 318,759.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,998.40 : 917,997.60 = 212,506.40 : x
  2. Step 2: Convert to fraction form
    611,998.40/917,997.60 = 212,506.40/x
  3. Step 3: Cross multiply
    611,998.40x = 917,997.60 × 212,506.40
  4. Step 4: Simplify right side
    611,998.40x = 195,080,365,184.64
  5. Step 5: Solve for x
    x = 195,080,365,184.64/611,998.40
  6. Step 6: Final answer
    x = 318,759.60

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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.