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Finding the Fourth Proportional to 91.57, 126.38 and 65.71

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Solution

The fourth proportional to 91.57, 126.38 and 65.71 is: 90.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.57 : 126.38 = 65.71 : x
  2. Step 2: Convert to fraction form
    91.57/126.38 = 65.71/x
  3. Step 3: Cross multiply
    91.57x = 126.38 × 65.71
  4. Step 4: Simplify right side
    91.57x = 8,304.43
  5. Step 5: Solve for x
    x = 8,304.43/91.57
  6. Step 6: Final answer
    x = 90.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.