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Finding the Fourth Proportional to 168.71, 232.79 and 103.20

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Solution

The fourth proportional to 168.71, 232.79 and 103.20 is: 142.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.71 : 232.79 = 103.20 : x
  2. Step 2: Convert to fraction form
    168.71/232.79 = 103.20/x
  3. Step 3: Cross multiply
    168.71x = 232.79 × 103.20
  4. Step 4: Simplify right side
    168.71x = 24,022.93
  5. Step 5: Solve for x
    x = 24,022.93/168.71
  6. Step 6: Final answer
    x = 142.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.