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Finding the Fourth Proportional to 387,607.52, 581,059.20 and 138,231.20

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Solution

The fourth proportional to 387,607.52, 581,059.20 and 138,231.20 is: 207,221.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,607.52 : 581,059.20 = 138,231.20 : x
  2. Step 2: Convert to fraction form
    387,607.52/581,059.20 = 138,231.20/x
  3. Step 3: Cross multiply
    387,607.52x = 581,059.20 × 138,231.20
  4. Step 4: Simplify right side
    387,607.52x = 80,320,510,487.04
  5. Step 5: Solve for x
    x = 80,320,510,487.04/387,607.52
  6. Step 6: Final answer
    x = 207,221.24

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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.