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Finding the Fourth Proportional to 80.42, 120.69 and 60.17

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Solution

The fourth proportional to 80.42, 120.69 and 60.17 is: 90.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.42 : 120.69 = 60.17 : x
  2. Step 2: Convert to fraction form
    80.42/120.69 = 60.17/x
  3. Step 3: Cross multiply
    80.42x = 120.69 × 60.17
  4. Step 4: Simplify right side
    80.42x = 7,261.92
  5. Step 5: Solve for x
    x = 7,261.92/80.42
  6. Step 6: Final answer
    x = 90.30

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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.