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Finding the Fourth Proportional to 91.30, 136.98 and 39.27

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Solution

The fourth proportional to 91.30, 136.98 and 39.27 is: 58.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.30 : 136.98 = 39.27 : x
  2. Step 2: Convert to fraction form
    91.30/136.98 = 39.27/x
  3. Step 3: Cross multiply
    91.30x = 136.98 × 39.27
  4. Step 4: Simplify right side
    91.30x = 5,379.20
  5. Step 5: Solve for x
    x = 5,379.20/91.30
  6. Step 6: Final answer
    x = 58.92

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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.