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Finding the Fourth Proportional to 91.26, 137.26 and 79.31

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Solution

The fourth proportional to 91.26, 137.26 and 79.31 is: 119.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.26 : 137.26 = 79.31 : x
  2. Step 2: Convert to fraction form
    91.26/137.26 = 79.31/x
  3. Step 3: Cross multiply
    91.26x = 137.26 × 79.31
  4. Step 4: Simplify right side
    91.26x = 10,886.53
  5. Step 5: Solve for x
    x = 10,886.53/91.26
  6. Step 6: Final answer
    x = 119.29

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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.