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Finding the Fourth Proportional to 120.17, 166.01 and 109.74

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Solution

The fourth proportional to 120.17, 166.01 and 109.74 is: 151.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.17 : 166.01 = 109.74 : x
  2. Step 2: Convert to fraction form
    120.17/166.01 = 109.74/x
  3. Step 3: Cross multiply
    120.17x = 166.01 × 109.74
  4. Step 4: Simplify right side
    120.17x = 18,217.94
  5. Step 5: Solve for x
    x = 18,217.94/120.17
  6. Step 6: Final answer
    x = 151.60

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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.