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Finding the Fourth Proportional to 782.54, 1,079.15 and 516.86

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Solution

The fourth proportional to 782.54, 1,079.15 and 516.86 is: 712.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.54 : 1,079.15 = 516.86 : x
  2. Step 2: Convert to fraction form
    782.54/1,079.15 = 516.86/x
  3. Step 3: Cross multiply
    782.54x = 1,079.15 × 516.86
  4. Step 4: Simplify right side
    782.54x = 557,763.95
  5. Step 5: Solve for x
    x = 557,763.95/782.54
  6. Step 6: Final answer
    x = 712.76

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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.