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Finding the Fourth Proportional to 120.03, 180.09 and 47.90

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Solution

The fourth proportional to 120.03, 180.09 and 47.90 is: 71.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.03 : 180.09 = 47.90 : x
  2. Step 2: Convert to fraction form
    120.03/180.09 = 47.90/x
  3. Step 3: Cross multiply
    120.03x = 180.09 × 47.90
  4. Step 4: Simplify right side
    120.03x = 8,625.41
  5. Step 5: Solve for x
    x = 8,625.41/120.03
  6. Step 6: Final answer
    x = 71.86

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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.