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Finding the Fourth Proportional to 90.97, 125.52 and 52.15

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Solution

The fourth proportional to 90.97, 125.52 and 52.15 is: 71.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.97 : 125.52 = 52.15 : x
  2. Step 2: Convert to fraction form
    90.97/125.52 = 52.15/x
  3. Step 3: Cross multiply
    90.97x = 125.52 × 52.15
  4. Step 4: Simplify right side
    90.97x = 6,545.87
  5. Step 5: Solve for x
    x = 6,545.87/90.97
  6. Step 6: Final answer
    x = 71.96

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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.