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Finding the Fourth Proportional to 80.55, 121.32 and 73.17

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Solution

The fourth proportional to 80.55, 121.32 and 73.17 is: 110.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.55 : 121.32 = 73.17 : x
  2. Step 2: Convert to fraction form
    80.55/121.32 = 73.17/x
  3. Step 3: Cross multiply
    80.55x = 121.32 × 73.17
  4. Step 4: Simplify right side
    80.55x = 8,876.98
  5. Step 5: Solve for x
    x = 8,876.98/80.55
  6. Step 6: Final answer
    x = 110.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.