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Finding the Fourth Proportional to 91.00, 136.35 and 86.71

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Solution

The fourth proportional to 91.00, 136.35 and 86.71 is: 129.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.00 : 136.35 = 86.71 : x
  2. Step 2: Convert to fraction form
    91.00/136.35 = 86.71/x
  3. Step 3: Cross multiply
    91.00x = 136.35 × 86.71
  4. Step 4: Simplify right side
    91.00x = 11,822.70
  5. Step 5: Solve for x
    x = 11,822.70/91.00
  6. Step 6: Final answer
    x = 129.91

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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.