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Finding the Fourth Proportional to 91.27, 126.54 and 86.66

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Solution

The fourth proportional to 91.27, 126.54 and 86.66 is: 120.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.27 : 126.54 = 86.66 : x
  2. Step 2: Convert to fraction form
    91.27/126.54 = 86.66/x
  3. Step 3: Cross multiply
    91.27x = 126.54 × 86.66
  4. Step 4: Simplify right side
    91.27x = 10,965.96
  5. Step 5: Solve for x
    x = 10,965.96/91.27
  6. Step 6: Final answer
    x = 120.15

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.