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Finding the Fourth Proportional to 515.40, 773.22 and 168.78

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Solution

The fourth proportional to 515.40, 773.22 and 168.78 is: 253.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.40 : 773.22 = 168.78 : x
  2. Step 2: Convert to fraction form
    515.40/773.22 = 168.78/x
  3. Step 3: Cross multiply
    515.40x = 773.22 × 168.78
  4. Step 4: Simplify right side
    515.40x = 130,504.07
  5. Step 5: Solve for x
    x = 130,504.07/515.40
  6. Step 6: Final answer
    x = 253.21

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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.