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Finding the Fourth Proportional to 174.20, 239.91 and 170.42

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Solution

The fourth proportional to 174.20, 239.91 and 170.42 is: 234.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.20 : 239.91 = 170.42 : x
  2. Step 2: Convert to fraction form
    174.20/239.91 = 170.42/x
  3. Step 3: Cross multiply
    174.20x = 239.91 × 170.42
  4. Step 4: Simplify right side
    174.20x = 40,885.46
  5. Step 5: Solve for x
    x = 40,885.46/174.20
  6. Step 6: Final answer
    x = 234.70

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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.