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Finding the Fourth Proportional to 91.07, 135.68 and 86.92

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Solution

The fourth proportional to 91.07, 135.68 and 86.92 is: 129.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.07 : 135.68 = 86.92 : x
  2. Step 2: Convert to fraction form
    91.07/135.68 = 86.92/x
  3. Step 3: Cross multiply
    91.07x = 135.68 × 86.92
  4. Step 4: Simplify right side
    91.07x = 11,793.29
  5. Step 5: Solve for x
    x = 11,793.29/91.07
  6. Step 6: Final answer
    x = 129.49

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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.