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Finding the Fourth Proportional to 169.92, 254.85 and 78.60

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Solution

The fourth proportional to 169.92, 254.85 and 78.60 is: 117.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.92 : 254.85 = 78.60 : x
  2. Step 2: Convert to fraction form
    169.92/254.85 = 78.60/x
  3. Step 3: Cross multiply
    169.92x = 254.85 × 78.60
  4. Step 4: Simplify right side
    169.92x = 20,031.21
  5. Step 5: Solve for x
    x = 20,031.21/169.92
  6. Step 6: Final answer
    x = 117.89

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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.