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Finding the Fourth Proportional to 515.98, 773.92 and 191.31

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Solution

The fourth proportional to 515.98, 773.92 and 191.31 is: 286.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.98 : 773.92 = 191.31 : x
  2. Step 2: Convert to fraction form
    515.98/773.92 = 191.31/x
  3. Step 3: Cross multiply
    515.98x = 773.92 × 191.31
  4. Step 4: Simplify right side
    515.98x = 148,058.64
  5. Step 5: Solve for x
    x = 148,058.64/515.98
  6. Step 6: Final answer
    x = 286.95

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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.