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Finding the Fourth Proportional to 91.26, 137.43 and 79.38

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Solution

The fourth proportional to 91.26, 137.43 and 79.38 is: 119.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.26 : 137.43 = 79.38 : x
  2. Step 2: Convert to fraction form
    91.26/137.43 = 79.38/x
  3. Step 3: Cross multiply
    91.26x = 137.43 × 79.38
  4. Step 4: Simplify right side
    91.26x = 10,909.19
  5. Step 5: Solve for x
    x = 10,909.19/91.26
  6. Step 6: Final answer
    x = 119.54

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.