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Finding the Fourth Proportional to 91.36, 136.79 and 69.59

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Solution

The fourth proportional to 91.36, 136.79 and 69.59 is: 104.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.36 : 136.79 = 69.59 : x
  2. Step 2: Convert to fraction form
    91.36/136.79 = 69.59/x
  3. Step 3: Cross multiply
    91.36x = 136.79 × 69.59
  4. Step 4: Simplify right side
    91.36x = 9,519.47
  5. Step 5: Solve for x
    x = 9,519.47/91.36
  6. Step 6: Final answer
    x = 104.20

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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.