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Finding the Fourth Proportional to 129,283.68, 178,404.96 and 72,691.68

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Solution

The fourth proportional to 129,283.68, 178,404.96 and 72,691.68 is: 100,310.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,283.68 : 178,404.96 = 72,691.68 : x
  2. Step 2: Convert to fraction form
    129,283.68/178,404.96 = 72,691.68/x
  3. Step 3: Cross multiply
    129,283.68x = 178,404.96 × 72,691.68
  4. Step 4: Simplify right side
    129,283.68x = 12,968,556,262.73
  5. Step 5: Solve for x
    x = 12,968,556,262.73/129,283.68
  6. Step 6: Final answer
    x = 100,310.85

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1.5x scale

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.