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Finding the Fourth Proportional to 169.87, 254.90 and 78.55

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Solution

The fourth proportional to 169.87, 254.90 and 78.55 is: 117.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.87 : 254.90 = 78.55 : x
  2. Step 2: Convert to fraction form
    169.87/254.90 = 78.55/x
  3. Step 3: Cross multiply
    169.87x = 254.90 × 78.55
  4. Step 4: Simplify right side
    169.87x = 20,022.40
  5. Step 5: Solve for x
    x = 20,022.40/169.87
  6. Step 6: Final answer
    x = 117.87

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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.