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Finding the Fourth Proportional to 168.81, 253.31 and 87.72

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Solution

The fourth proportional to 168.81, 253.31 and 87.72 is: 131.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.81 : 253.31 = 87.72 : x
  2. Step 2: Convert to fraction form
    168.81/253.31 = 87.72/x
  3. Step 3: Cross multiply
    168.81x = 253.31 × 87.72
  4. Step 4: Simplify right side
    168.81x = 22,219.91
  5. Step 5: Solve for x
    x = 22,219.91/168.81
  6. Step 6: Final answer
    x = 131.63

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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.