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Finding the Fourth Proportional to 129,375.72, 178,538.49 and 72,787.09

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Solution

The fourth proportional to 129,375.72, 178,538.49 and 72,787.09 is: 100,446.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,375.72 : 178,538.49 = 72,787.09 : x
  2. Step 2: Convert to fraction form
    129,375.72/178,538.49 = 72,787.09/x
  3. Step 3: Cross multiply
    129,375.72x = 178,538.49 × 72,787.09
  4. Step 4: Simplify right side
    129,375.72x = 12,995,297,140.09
  5. Step 5: Solve for x
    x = 12,995,297,140.09/129,375.72
  6. Step 6: Final answer
    x = 100,446.18

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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.