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Finding the Fourth Proportional to 168.40, 252.63 and 77.11

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Solution

The fourth proportional to 168.40, 252.63 and 77.11 is: 115.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.40 : 252.63 = 77.11 : x
  2. Step 2: Convert to fraction form
    168.40/252.63 = 77.11/x
  3. Step 3: Cross multiply
    168.40x = 252.63 × 77.11
  4. Step 4: Simplify right side
    168.40x = 19,480.30
  5. Step 5: Solve for x
    x = 19,480.30/168.40
  6. Step 6: Final answer
    x = 115.68

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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.