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Finding the Fourth Proportional to 120.89, 166.85 and 79.63

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Solution

The fourth proportional to 120.89, 166.85 and 79.63 is: 109.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.89 : 166.85 = 79.63 : x
  2. Step 2: Convert to fraction form
    120.89/166.85 = 79.63/x
  3. Step 3: Cross multiply
    120.89x = 166.85 × 79.63
  4. Step 4: Simplify right side
    120.89x = 13,285.61
  5. Step 5: Solve for x
    x = 13,285.61/120.89
  6. Step 6: Final answer
    x = 109.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.