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Finding the Fourth Proportional to 120.45, 166.22 and 76.19

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Solution

The fourth proportional to 120.45, 166.22 and 76.19 is: 105.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.45 : 166.22 = 76.19 : x
  2. Step 2: Convert to fraction form
    120.45/166.22 = 76.19/x
  3. Step 3: Cross multiply
    120.45x = 166.22 × 76.19
  4. Step 4: Simplify right side
    120.45x = 12,663.38
  5. Step 5: Solve for x
    x = 12,663.38/120.45
  6. Step 6: Final answer
    x = 105.13

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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.