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Finding the Fourth Proportional to 125,098.92, 172,620.90 and 71,378.28

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Solution

The fourth proportional to 125,098.92, 172,620.90 and 71,378.28 is: 98,493.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,098.92 : 172,620.90 = 71,378.28 : x
  2. Step 2: Convert to fraction form
    125,098.92/172,620.90 = 71,378.28/x
  3. Step 3: Cross multiply
    125,098.92x = 172,620.90 × 71,378.28
  4. Step 4: Simplify right side
    125,098.92x = 12,321,382,934.05
  5. Step 5: Solve for x
    x = 12,321,382,934.05/125,098.92
  6. Step 6: Final answer
    x = 98,493.12

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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.