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Finding the Fourth Proportional to 91.50, 136.61 and 85.02

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Solution

The fourth proportional to 91.50, 136.61 and 85.02 is: 126.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.50 : 136.61 = 85.02 : x
  2. Step 2: Convert to fraction form
    91.50/136.61 = 85.02/x
  3. Step 3: Cross multiply
    91.50x = 136.61 × 85.02
  4. Step 4: Simplify right side
    91.50x = 11,614.16
  5. Step 5: Solve for x
    x = 11,614.16/91.50
  6. Step 6: Final answer
    x = 126.93

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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.