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Finding the Fourth Proportional to 91.53, 137.05 and 72.31

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Solution

The fourth proportional to 91.53, 137.05 and 72.31 is: 108.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.53 : 137.05 = 72.31 : x
  2. Step 2: Convert to fraction form
    91.53/137.05 = 72.31/x
  3. Step 3: Cross multiply
    91.53x = 137.05 × 72.31
  4. Step 4: Simplify right side
    91.53x = 9,909.56
  5. Step 5: Solve for x
    x = 9,909.56/91.53
  6. Step 6: Final answer
    x = 108.27

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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.