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Finding the Fourth Proportional to 169.97, 254.85 and 78.68

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Solution

The fourth proportional to 169.97, 254.85 and 78.68 is: 117.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.97 : 254.85 = 78.68 : x
  2. Step 2: Convert to fraction form
    169.97/254.85 = 78.68/x
  3. Step 3: Cross multiply
    169.97x = 254.85 × 78.68
  4. Step 4: Simplify right side
    169.97x = 20,050.32
  5. Step 5: Solve for x
    x = 20,050.32/169.97
  6. Step 6: Final answer
    x = 117.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.