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Finding the Fourth Proportional to 91.87, 136.96 and 87.55

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Solution

The fourth proportional to 91.87, 136.96 and 87.55 is: 130.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.87 : 136.96 = 87.55 : x
  2. Step 2: Convert to fraction form
    91.87/136.96 = 87.55/x
  3. Step 3: Cross multiply
    91.87x = 136.96 × 87.55
  4. Step 4: Simplify right side
    91.87x = 11,990.63
  5. Step 5: Solve for x
    x = 11,990.63/91.87
  6. Step 6: Final answer
    x = 130.52

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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.