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Finding the Fourth Proportional to 515.19, 772.91 and 168.55

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Solution

The fourth proportional to 515.19, 772.91 and 168.55 is: 252.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.19 : 772.91 = 168.55 : x
  2. Step 2: Convert to fraction form
    515.19/772.91 = 168.55/x
  3. Step 3: Cross multiply
    515.19x = 772.91 × 168.55
  4. Step 4: Simplify right side
    515.19x = 130,273.98
  5. Step 5: Solve for x
    x = 130,273.98/515.19
  6. Step 6: Final answer
    x = 252.87

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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.