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Finding the Fourth Proportional to 129,326.42, 178,468.74 and 72,737.80

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Solution

The fourth proportional to 129,326.42, 178,468.74 and 72,737.80 is: 100,377.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,326.42 : 178,468.74 = 72,737.80 : x
  2. Step 2: Convert to fraction form
    129,326.42/178,468.74 = 72,737.80/x
  3. Step 3: Cross multiply
    129,326.42x = 178,468.74 × 72,737.80
  4. Step 4: Simplify right side
    129,326.42x = 12,981,423,070.20
  5. Step 5: Solve for x
    x = 12,981,423,070.20/129,326.42
  6. Step 6: Final answer
    x = 100,377.19

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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.