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Finding the Fourth Proportional to 120.60, 179.42 and 120.20

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Solution

The fourth proportional to 120.60, 179.42 and 120.20 is: 178.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.60 : 179.42 = 120.20 : x
  2. Step 2: Convert to fraction form
    120.60/179.42 = 120.20/x
  3. Step 3: Cross multiply
    120.60x = 179.42 × 120.20
  4. Step 4: Simplify right side
    120.60x = 21,565.69
  5. Step 5: Solve for x
    x = 21,565.69/120.60
  6. Step 6: Final answer
    x = 178.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.