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Finding the Fourth Proportional to 936.13, 1,291.80 and 516.49

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Solution

The fourth proportional to 936.13, 1,291.80 and 516.49 is: 712.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.13 : 1,291.80 = 516.49 : x
  2. Step 2: Convert to fraction form
    936.13/1,291.80 = 516.49/x
  3. Step 3: Cross multiply
    936.13x = 1,291.80 × 516.49
  4. Step 4: Simplify right side
    936.13x = 667,201.78
  5. Step 5: Solve for x
    x = 667,201.78/936.13
  6. Step 6: Final answer
    x = 712.72

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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.