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Finding the Fourth Proportional to 91.28, 136.64 and 79.13

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Solution

The fourth proportional to 91.28, 136.64 and 79.13 is: 118.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.28 : 136.64 = 79.13 : x
  2. Step 2: Convert to fraction form
    91.28/136.64 = 79.13/x
  3. Step 3: Cross multiply
    91.28x = 136.64 × 79.13
  4. Step 4: Simplify right side
    91.28x = 10,811.24
  5. Step 5: Solve for x
    x = 10,811.24/91.28
  6. Step 6: Final answer
    x = 118.45

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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.