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Finding the Fourth Proportional to 312.69, 469.17 and 168.39

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Solution

The fourth proportional to 312.69, 469.17 and 168.39 is: 252.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.69 : 469.17 = 168.39 : x
  2. Step 2: Convert to fraction form
    312.69/469.17 = 168.39/x
  3. Step 3: Cross multiply
    312.69x = 469.17 × 168.39
  4. Step 4: Simplify right side
    312.69x = 79,003.54
  5. Step 5: Solve for x
    x = 79,003.54/312.69
  6. Step 6: Final answer
    x = 252.66

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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.