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Finding the Fourth Proportional to 129,332.30, 193,830.30 and 72,403.88

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Solution

The fourth proportional to 129,332.30, 193,830.30 and 72,403.88 is: 108,511.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,332.30 : 193,830.30 = 72,403.88 : x
  2. Step 2: Convert to fraction form
    129,332.30/193,830.30 = 72,403.88/x
  3. Step 3: Cross multiply
    129,332.30x = 193,830.30 × 72,403.88
  4. Step 4: Simplify right side
    129,332.30x = 14,034,064,812.41
  5. Step 5: Solve for x
    x = 14,034,064,812.41/129,332.30
  6. Step 6: Final answer
    x = 108,511.68

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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.