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Finding the Fourth Proportional to 168.71, 253.03 and 86.40

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Solution

The fourth proportional to 168.71, 253.03 and 86.40 is: 129.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.71 : 253.03 = 86.40 : x
  2. Step 2: Convert to fraction form
    168.71/253.03 = 86.40/x
  3. Step 3: Cross multiply
    168.71x = 253.03 × 86.40
  4. Step 4: Simplify right side
    168.71x = 21,861.73
  5. Step 5: Solve for x
    x = 21,861.73/168.71
  6. Step 6: Final answer
    x = 129.58

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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.