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Finding the Fourth Proportional to 174.57, 261.92 and 78.31

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Solution

The fourth proportional to 174.57, 261.92 and 78.31 is: 117.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.57 : 261.92 = 78.31 : x
  2. Step 2: Convert to fraction form
    174.57/261.92 = 78.31/x
  3. Step 3: Cross multiply
    174.57x = 261.92 × 78.31
  4. Step 4: Simplify right side
    174.57x = 20,510.96
  5. Step 5: Solve for x
    x = 20,510.96/174.57
  6. Step 6: Final answer
    x = 117.49

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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.