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Finding the Fourth Proportional to 91.64, 137.13 and 89

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Solution

The fourth proportional to 91.64, 137.13 and 89 is: 133.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.64 : 137.13 = 89 : x
  2. Step 2: Convert to fraction form
    91.64/137.13 = 89/x
  3. Step 3: Cross multiply
    91.64x = 137.13 × 89
  4. Step 4: Simplify right side
    91.64x = 12,204.57
  5. Step 5: Solve for x
    x = 12,204.57/91.64
  6. Step 6: Final answer
    x = 133.18

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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.