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Finding the Fourth Proportional to 91.18, 136.63 and 80.29

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Solution

The fourth proportional to 91.18, 136.63 and 80.29 is: 120.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.18 : 136.63 = 80.29 : x
  2. Step 2: Convert to fraction form
    91.18/136.63 = 80.29/x
  3. Step 3: Cross multiply
    91.18x = 136.63 × 80.29
  4. Step 4: Simplify right side
    91.18x = 10,970.02
  5. Step 5: Solve for x
    x = 10,970.02/91.18
  6. Step 6: Final answer
    x = 120.31

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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.