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Finding the Fourth Proportional to 71,478.53, 98,639.65 and 39,646.61

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Solution

The fourth proportional to 71,478.53, 98,639.65 and 39,646.61 is: 54,711.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,478.53 : 98,639.65 = 39,646.61 : x
  2. Step 2: Convert to fraction form
    71,478.53/98,639.65 = 39,646.61/x
  3. Step 3: Cross multiply
    71,478.53x = 98,639.65 × 39,646.61
  4. Step 4: Simplify right side
    71,478.53x = 3,910,727,660.35
  5. Step 5: Solve for x
    x = 3,910,727,660.35/71,478.53
  6. Step 6: Final answer
    x = 54,711.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.