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Finding the Fourth Proportional to 80.46, 121.14 and 69.12

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Solution

The fourth proportional to 80.46, 121.14 and 69.12 is: 104.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.46 : 121.14 = 69.12 : x
  2. Step 2: Convert to fraction form
    80.46/121.14 = 69.12/x
  3. Step 3: Cross multiply
    80.46x = 121.14 × 69.12
  4. Step 4: Simplify right side
    80.46x = 8,373.20
  5. Step 5: Solve for x
    x = 8,373.20/80.46
  6. Step 6: Final answer
    x = 104.07

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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.