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Finding the Fourth Proportional to 174.26, 261.31 and 78

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Solution

The fourth proportional to 174.26, 261.31 and 78 is: 116.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.26 : 261.31 = 78 : x
  2. Step 2: Convert to fraction form
    174.26/261.31 = 78/x
  3. Step 3: Cross multiply
    174.26x = 261.31 × 78
  4. Step 4: Simplify right side
    174.26x = 20,382.18
  5. Step 5: Solve for x
    x = 20,382.18/174.26
  6. Step 6: Final answer
    x = 116.96

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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.