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Finding the Fourth Proportional to 778.47, 1,074.56 and 516.57

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Solution

The fourth proportional to 778.47, 1,074.56 and 516.57 is: 713.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.47 : 1,074.56 = 516.57 : x
  2. Step 2: Convert to fraction form
    778.47/1,074.56 = 516.57/x
  3. Step 3: Cross multiply
    778.47x = 1,074.56 × 516.57
  4. Step 4: Simplify right side
    778.47x = 555,085.46
  5. Step 5: Solve for x
    x = 555,085.46/778.47
  6. Step 6: Final answer
    x = 713.05

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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.