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Finding the Fourth Proportional to 515.57, 772.88 and 168.69

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Solution

The fourth proportional to 515.57, 772.88 and 168.69 is: 252.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.57 : 772.88 = 168.69 : x
  2. Step 2: Convert to fraction form
    515.57/772.88 = 168.69/x
  3. Step 3: Cross multiply
    515.57x = 772.88 × 168.69
  4. Step 4: Simplify right side
    515.57x = 130,377.13
  5. Step 5: Solve for x
    x = 130,377.13/515.57
  6. Step 6: Final answer
    x = 252.88

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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.