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Finding the Fourth Proportional to 120.29, 166.05 and 113.47

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Solution

The fourth proportional to 120.29, 166.05 and 113.47 is: 156.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.29 : 166.05 = 113.47 : x
  2. Step 2: Convert to fraction form
    120.29/166.05 = 113.47/x
  3. Step 3: Cross multiply
    120.29x = 166.05 × 113.47
  4. Step 4: Simplify right side
    120.29x = 18,841.28
  5. Step 5: Solve for x
    x = 18,841.28/120.29
  6. Step 6: Final answer
    x = 156.64

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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.