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Finding the Fourth Proportional to 515.79, 711.92 and 319.19

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Solution

The fourth proportional to 515.79, 711.92 and 319.19 is: 440.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.79 : 711.92 = 319.19 : x
  2. Step 2: Convert to fraction form
    515.79/711.92 = 319.19/x
  3. Step 3: Cross multiply
    515.79x = 711.92 × 319.19
  4. Step 4: Simplify right side
    515.79x = 227,234.98
  5. Step 5: Solve for x
    x = 227,234.98/515.79
  6. Step 6: Final answer
    x = 440.56

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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.