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Finding the Fourth Proportional to 515.31, 772.41 and 168.55

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Solution

The fourth proportional to 515.31, 772.41 and 168.55 is: 252.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.31 : 772.41 = 168.55 : x
  2. Step 2: Convert to fraction form
    515.31/772.41 = 168.55/x
  3. Step 3: Cross multiply
    515.31x = 772.41 × 168.55
  4. Step 4: Simplify right side
    515.31x = 130,187.77
  5. Step 5: Solve for x
    x = 130,187.77/515.31
  6. Step 6: Final answer
    x = 252.64

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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.