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Finding the Fourth Proportional to 91.12, 135.88 and 89.04

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Solution

The fourth proportional to 91.12, 135.88 and 89.04 is: 132.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.12 : 135.88 = 89.04 : x
  2. Step 2: Convert to fraction form
    91.12/135.88 = 89.04/x
  3. Step 3: Cross multiply
    91.12x = 135.88 × 89.04
  4. Step 4: Simplify right side
    91.12x = 12,098.76
  5. Step 5: Solve for x
    x = 12,098.76/91.12
  6. Step 6: Final answer
    x = 132.78

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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.