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Finding the Fourth Proportional to 120.32, 166.03 and 78.89

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Solution

The fourth proportional to 120.32, 166.03 and 78.89 is: 108.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.32 : 166.03 = 78.89 : x
  2. Step 2: Convert to fraction form
    120.32/166.03 = 78.89/x
  3. Step 3: Cross multiply
    120.32x = 166.03 × 78.89
  4. Step 4: Simplify right side
    120.32x = 13,097.28
  5. Step 5: Solve for x
    x = 13,097.28/120.32
  6. Step 6: Final answer
    x = 108.85

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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.