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Finding the Fourth Proportional to 640,008.40, 960,012.60 and 402,581.20

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Solution

The fourth proportional to 640,008.40, 960,012.60 and 402,581.20 is: 603,871.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,008.40 : 960,012.60 = 402,581.20 : x
  2. Step 2: Convert to fraction form
    640,008.40/960,012.60 = 402,581.20/x
  3. Step 3: Cross multiply
    640,008.40x = 960,012.60 × 402,581.20
  4. Step 4: Simplify right side
    640,008.40x = 386,483,024,523.12
  5. Step 5: Solve for x
    x = 386,483,024,523.12/640,008.40
  6. Step 6: Final answer
    x = 603,871.80

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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.