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Finding the Fourth Proportional to 91.28, 136.36 and 79.22

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Solution

The fourth proportional to 91.28, 136.36 and 79.22 is: 118.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.28 : 136.36 = 79.22 : x
  2. Step 2: Convert to fraction form
    91.28/136.36 = 79.22/x
  3. Step 3: Cross multiply
    91.28x = 136.36 × 79.22
  4. Step 4: Simplify right side
    91.28x = 10,802.44
  5. Step 5: Solve for x
    x = 10,802.44/91.28
  6. Step 6: Final answer
    x = 118.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.