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Finding the Fourth Proportional to 778.52, 1,074.39 and 516.80

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Solution

The fourth proportional to 778.52, 1,074.39 and 516.80 is: 713.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.52 : 1,074.39 = 516.80 : x
  2. Step 2: Convert to fraction form
    778.52/1,074.39 = 516.80/x
  3. Step 3: Cross multiply
    778.52x = 1,074.39 × 516.80
  4. Step 4: Simplify right side
    778.52x = 555,244.75
  5. Step 5: Solve for x
    x = 555,244.75/778.52
  6. Step 6: Final answer
    x = 713.21

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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.