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Finding the Fourth Proportional to 168.74, 253.17 and 87.56

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Solution

The fourth proportional to 168.74, 253.17 and 87.56 is: 131.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.74 : 253.17 = 87.56 : x
  2. Step 2: Convert to fraction form
    168.74/253.17 = 87.56/x
  3. Step 3: Cross multiply
    168.74x = 253.17 × 87.56
  4. Step 4: Simplify right side
    168.74x = 22,167.57
  5. Step 5: Solve for x
    x = 22,167.57/168.74
  6. Step 6: Final answer
    x = 131.37

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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.