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Finding the Fourth Proportional to 120.29, 180.21 and 74.66

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Solution

The fourth proportional to 120.29, 180.21 and 74.66 is: 111.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.29 : 180.21 = 74.66 : x
  2. Step 2: Convert to fraction form
    120.29/180.21 = 74.66/x
  3. Step 3: Cross multiply
    120.29x = 180.21 × 74.66
  4. Step 4: Simplify right side
    120.29x = 13,454.48
  5. Step 5: Solve for x
    x = 13,454.48/120.29
  6. Step 6: Final answer
    x = 111.85

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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.