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Finding the Fourth Proportional to 515.38, 711.18 and 318.88

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Solution

The fourth proportional to 515.38, 711.18 and 318.88 is: 440.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.38 : 711.18 = 318.88 : x
  2. Step 2: Convert to fraction form
    515.38/711.18 = 318.88/x
  3. Step 3: Cross multiply
    515.38x = 711.18 × 318.88
  4. Step 4: Simplify right side
    515.38x = 226,781.08
  5. Step 5: Solve for x
    x = 226,781.08/515.38
  6. Step 6: Final answer
    x = 440.03

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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.