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Finding the Fourth Proportional to 168.72, 232.70 and 139.56

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Solution

The fourth proportional to 168.72, 232.70 and 139.56 is: 192.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.72 : 232.70 = 139.56 : x
  2. Step 2: Convert to fraction form
    168.72/232.70 = 139.56/x
  3. Step 3: Cross multiply
    168.72x = 232.70 × 139.56
  4. Step 4: Simplify right side
    168.72x = 32,475.61
  5. Step 5: Solve for x
    x = 32,475.61/168.72
  6. Step 6: Final answer
    x = 192.48

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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.