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Finding the Fourth Proportional to 174.20, 261.17 and 87.45

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Solution

The fourth proportional to 174.20, 261.17 and 87.45 is: 131.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.20 : 261.17 = 87.45 : x
  2. Step 2: Convert to fraction form
    174.20/261.17 = 87.45/x
  3. Step 3: Cross multiply
    174.20x = 261.17 × 87.45
  4. Step 4: Simplify right side
    174.20x = 22,839.86
  5. Step 5: Solve for x
    x = 22,839.86/174.20
  6. Step 6: Final answer
    x = 131.12

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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.