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Finding the Fourth Proportional to 168.77, 253.15 and 82.09

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Solution

The fourth proportional to 168.77, 253.15 and 82.09 is: 123.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.77 : 253.15 = 82.09 : x
  2. Step 2: Convert to fraction form
    168.77/253.15 = 82.09/x
  3. Step 3: Cross multiply
    168.77x = 253.15 × 82.09
  4. Step 4: Simplify right side
    168.77x = 20,781.50
  5. Step 5: Solve for x
    x = 20,781.50/168.77
  6. Step 6: Final answer
    x = 123.13

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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.