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Finding the Fourth Proportional to 91.28, 136.86 and 39.22

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Solution

The fourth proportional to 91.28, 136.86 and 39.22 is: 58.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.28 : 136.86 = 39.22 : x
  2. Step 2: Convert to fraction form
    91.28/136.86 = 39.22/x
  3. Step 3: Cross multiply
    91.28x = 136.86 × 39.22
  4. Step 4: Simplify right side
    91.28x = 5,367.65
  5. Step 5: Solve for x
    x = 5,367.65/91.28
  6. Step 6: Final answer
    x = 58.80

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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.