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Finding the Fourth Proportional to 936.11, 1,291.80 and 516.47

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Solution

The fourth proportional to 936.11, 1,291.80 and 516.47 is: 712.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.11 : 1,291.80 = 516.47 : x
  2. Step 2: Convert to fraction form
    936.11/1,291.80 = 516.47/x
  3. Step 3: Cross multiply
    936.11x = 1,291.80 × 516.47
  4. Step 4: Simplify right side
    936.11x = 667,175.95
  5. Step 5: Solve for x
    x = 667,175.95/936.11
  6. Step 6: Final answer
    x = 712.71

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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.