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Finding the Fourth Proportional to 120.03, 179.80 and 71.91

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Solution

The fourth proportional to 120.03, 179.80 and 71.91 is: 107.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.03 : 179.80 = 71.91 : x
  2. Step 2: Convert to fraction form
    120.03/179.80 = 71.91/x
  3. Step 3: Cross multiply
    120.03x = 179.80 × 71.91
  4. Step 4: Simplify right side
    120.03x = 12,929.42
  5. Step 5: Solve for x
    x = 12,929.42/120.03
  6. Step 6: Final answer
    x = 107.72

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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.