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Finding the Fourth Proportional to 129,375.90, 178,538.49 and 72,787.32

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Solution

The fourth proportional to 129,375.90, 178,538.49 and 72,787.32 is: 100,446.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,375.90 : 178,538.49 = 72,787.32 : x
  2. Step 2: Convert to fraction form
    129,375.90/178,538.49 = 72,787.32/x
  3. Step 3: Cross multiply
    129,375.90x = 178,538.49 × 72,787.32
  4. Step 4: Simplify right side
    129,375.90x = 12,995,338,203.95
  5. Step 5: Solve for x
    x = 12,995,338,203.95/129,375.90
  6. Step 6: Final answer
    x = 100,446.36

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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.