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Finding the Fourth Proportional to 120.12, 180.02 and 47.90

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Solution

The fourth proportional to 120.12, 180.02 and 47.90 is: 71.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.12 : 180.02 = 47.90 : x
  2. Step 2: Convert to fraction form
    120.12/180.02 = 47.90/x
  3. Step 3: Cross multiply
    120.12x = 180.02 × 47.90
  4. Step 4: Simplify right side
    120.12x = 8,622.18
  5. Step 5: Solve for x
    x = 8,622.18/120.12
  6. Step 6: Final answer
    x = 71.78

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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.