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Finding the Fourth Proportional to 91.19, 136.96 and 89.15

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Solution

The fourth proportional to 91.19, 136.96 and 89.15 is: 133.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.19 : 136.96 = 89.15 : x
  2. Step 2: Convert to fraction form
    91.19/136.96 = 89.15/x
  3. Step 3: Cross multiply
    91.19x = 136.96 × 89.15
  4. Step 4: Simplify right side
    91.19x = 12,209.08
  5. Step 5: Solve for x
    x = 12,209.08/91.19
  6. Step 6: Final answer
    x = 133.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.