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Finding the Fourth Proportional to 120.45, 166.11 and 90.42

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Solution

The fourth proportional to 120.45, 166.11 and 90.42 is: 124.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.45 : 166.11 = 90.42 : x
  2. Step 2: Convert to fraction form
    120.45/166.11 = 90.42/x
  3. Step 3: Cross multiply
    120.45x = 166.11 × 90.42
  4. Step 4: Simplify right side
    120.45x = 15,019.12
  5. Step 5: Solve for x
    x = 15,019.12/120.45
  6. Step 6: Final answer
    x = 124.69

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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.