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Finding the Fourth Proportional to 618.31, 928.50 and 516.39

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Solution

The fourth proportional to 618.31, 928.50 and 516.39 is: 775.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.31 : 928.50 = 516.39 : x
  2. Step 2: Convert to fraction form
    618.31/928.50 = 516.39/x
  3. Step 3: Cross multiply
    618.31x = 928.50 × 516.39
  4. Step 4: Simplify right side
    618.31x = 479,462.70
  5. Step 5: Solve for x
    x = 479,462.70/618.31
  6. Step 6: Final answer
    x = 775.44

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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.