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Finding the Fourth Proportional to 515.82, 711 and 318.96

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Solution

The fourth proportional to 515.82, 711 and 318.96 is: 439.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.82 : 711 = 318.96 : x
  2. Step 2: Convert to fraction form
    515.82/711 = 318.96/x
  3. Step 3: Cross multiply
    515.82x = 711 × 318.96
  4. Step 4: Simplify right side
    515.82x = 226,780.56
  5. Step 5: Solve for x
    x = 226,780.56/515.82
  6. Step 6: Final answer
    x = 439.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.