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Finding the Fourth Proportional to 72,387.64, 108,513.38 and 39,057.76

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Solution

The fourth proportional to 72,387.64, 108,513.38 and 39,057.76 is: 58,549.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,387.64 : 108,513.38 = 39,057.76 : x
  2. Step 2: Convert to fraction form
    72,387.64/108,513.38 = 39,057.76/x
  3. Step 3: Cross multiply
    72,387.64x = 108,513.38 × 39,057.76
  4. Step 4: Simplify right side
    72,387.64x = 4,238,289,552.83
  5. Step 5: Solve for x
    x = 4,238,289,552.83/72,387.64
  6. Step 6: Final answer
    x = 58,549.91

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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.