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Finding the Fourth Proportional to 91.10, 136.85 and 79.36

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Solution

The fourth proportional to 91.10, 136.85 and 79.36 is: 119.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.10 : 136.85 = 79.36 : x
  2. Step 2: Convert to fraction form
    91.10/136.85 = 79.36/x
  3. Step 3: Cross multiply
    91.10x = 136.85 × 79.36
  4. Step 4: Simplify right side
    91.10x = 10,860.42
  5. Step 5: Solve for x
    x = 10,860.42/91.10
  6. Step 6: Final answer
    x = 119.21

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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.