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Finding the Fourth Proportional to 936.11, 1,291.76 and 516.46

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Solution

The fourth proportional to 936.11, 1,291.76 and 516.46 is: 712.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.11 : 1,291.76 = 516.46 : x
  2. Step 2: Convert to fraction form
    936.11/1,291.76 = 516.46/x
  3. Step 3: Cross multiply
    936.11x = 1,291.76 × 516.46
  4. Step 4: Simplify right side
    936.11x = 667,143.82
  5. Step 5: Solve for x
    x = 667,143.82/936.11
  6. Step 6: Final answer
    x = 712.68

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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.