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Finding the Fourth Proportional to 169.85, 254.50 and 78.53

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Solution

The fourth proportional to 169.85, 254.50 and 78.53 is: 117.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.85 : 254.50 = 78.53 : x
  2. Step 2: Convert to fraction form
    169.85/254.50 = 78.53/x
  3. Step 3: Cross multiply
    169.85x = 254.50 × 78.53
  4. Step 4: Simplify right side
    169.85x = 19,984.42
  5. Step 5: Solve for x
    x = 19,984.42/169.85
  6. Step 6: Final answer
    x = 117.66

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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.