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Finding the Fourth Proportional to 120.17, 180.20 and 51.65

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Solution

The fourth proportional to 120.17, 180.20 and 51.65 is: 77.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.17 : 180.20 = 51.65 : x
  2. Step 2: Convert to fraction form
    120.17/180.20 = 51.65/x
  3. Step 3: Cross multiply
    120.17x = 180.20 × 51.65
  4. Step 4: Simplify right side
    120.17x = 9,306.17
  5. Step 5: Solve for x
    x = 9,306.17/120.17
  6. Step 6: Final answer
    x = 77.44

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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.