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Finding the Fourth Proportional to 168.20, 232.42 and 156.68

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Solution

The fourth proportional to 168.20, 232.42 and 156.68 is: 216.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.20 : 232.42 = 156.68 : x
  2. Step 2: Convert to fraction form
    168.20/232.42 = 156.68/x
  3. Step 3: Cross multiply
    168.20x = 232.42 × 156.68
  4. Step 4: Simplify right side
    168.20x = 36,415.57
  5. Step 5: Solve for x
    x = 36,415.57/168.20
  6. Step 6: Final answer
    x = 216.50

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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.