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Finding the Fourth Proportional to 80.18, 120.30 and 39.62

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Solution

The fourth proportional to 80.18, 120.30 and 39.62 is: 59.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.18 : 120.30 = 39.62 : x
  2. Step 2: Convert to fraction form
    80.18/120.30 = 39.62/x
  3. Step 3: Cross multiply
    80.18x = 120.30 × 39.62
  4. Step 4: Simplify right side
    80.18x = 4,766.29
  5. Step 5: Solve for x
    x = 4,766.29/80.18
  6. Step 6: Final answer
    x = 59.44

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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.