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Finding the Fourth Proportional to 91.65, 137.27 and 71.20

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Solution

The fourth proportional to 91.65, 137.27 and 71.20 is: 106.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.65 : 137.27 = 71.20 : x
  2. Step 2: Convert to fraction form
    91.65/137.27 = 71.20/x
  3. Step 3: Cross multiply
    91.65x = 137.27 × 71.20
  4. Step 4: Simplify right side
    91.65x = 9,773.62
  5. Step 5: Solve for x
    x = 9,773.62/91.65
  6. Step 6: Final answer
    x = 106.64

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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.