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Finding the Fourth Proportional to 125.91, 187.92 and 115.65

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Solution

The fourth proportional to 125.91, 187.92 and 115.65 is: 172.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.91 : 187.92 = 115.65 : x
  2. Step 2: Convert to fraction form
    125.91/187.92 = 115.65/x
  3. Step 3: Cross multiply
    125.91x = 187.92 × 115.65
  4. Step 4: Simplify right side
    125.91x = 21,732.95
  5. Step 5: Solve for x
    x = 21,732.95/125.91
  6. Step 6: Final answer
    x = 172.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.