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Finding the Fourth Proportional to 120.69, 166.39 and 120.15

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Solution

The fourth proportional to 120.69, 166.39 and 120.15 is: 165.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.69 : 166.39 = 120.15 : x
  2. Step 2: Convert to fraction form
    120.69/166.39 = 120.15/x
  3. Step 3: Cross multiply
    120.69x = 166.39 × 120.15
  4. Step 4: Simplify right side
    120.69x = 19,991.46
  5. Step 5: Solve for x
    x = 19,991.46/120.69
  6. Step 6: Final answer
    x = 165.64

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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.