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Finding the Fourth Proportional to 168.72, 232.80 and 117.12

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Solution

The fourth proportional to 168.72, 232.80 and 117.12 is: 161.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.72 : 232.80 = 117.12 : x
  2. Step 2: Convert to fraction form
    168.72/232.80 = 117.12/x
  3. Step 3: Cross multiply
    168.72x = 232.80 × 117.12
  4. Step 4: Simplify right side
    168.72x = 27,265.54
  5. Step 5: Solve for x
    x = 27,265.54/168.72
  6. Step 6: Final answer
    x = 161.60

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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.