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Finding the Fourth Proportional to 387,715.52, 581,651.28 and 138,391.04

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Solution

The fourth proportional to 387,715.52, 581,651.28 and 138,391.04 is: 207,614.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,715.52 : 581,651.28 = 138,391.04 : x
  2. Step 2: Convert to fraction form
    387,715.52/581,651.28 = 138,391.04/x
  3. Step 3: Cross multiply
    387,715.52x = 581,651.28 × 138,391.04
  4. Step 4: Simplify right side
    387,715.52x = 80,495,325,556.53
  5. Step 5: Solve for x
    x = 80,495,325,556.53/387,715.52
  6. Step 6: Final answer
    x = 207,614.40

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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.