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Finding the Fourth Proportional to 91.25, 136.91 and 47.91

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Solution

The fourth proportional to 91.25, 136.91 and 47.91 is: 71.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.25 : 136.91 = 47.91 : x
  2. Step 2: Convert to fraction form
    91.25/136.91 = 47.91/x
  3. Step 3: Cross multiply
    91.25x = 136.91 × 47.91
  4. Step 4: Simplify right side
    91.25x = 6,559.36
  5. Step 5: Solve for x
    x = 6,559.36/91.25
  6. Step 6: Final answer
    x = 71.88

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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.