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Finding the Fourth Proportional to 174.20, 261.45 and 71.55

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Solution

The fourth proportional to 174.20, 261.45 and 71.55 is: 107.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.20 : 261.45 = 71.55 : x
  2. Step 2: Convert to fraction form
    174.20/261.45 = 71.55/x
  3. Step 3: Cross multiply
    174.20x = 261.45 × 71.55
  4. Step 4: Simplify right side
    174.20x = 18,706.75
  5. Step 5: Solve for x
    x = 18,706.75/174.20
  6. Step 6: Final answer
    x = 107.39

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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.