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Finding the Fourth Proportional to 936.16, 1,291.82 and 516.49

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Solution

The fourth proportional to 936.16, 1,291.82 and 516.49 is: 712.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.16 : 1,291.82 = 516.49 : x
  2. Step 2: Convert to fraction form
    936.16/1,291.82 = 516.49/x
  3. Step 3: Cross multiply
    936.16x = 1,291.82 × 516.49
  4. Step 4: Simplify right side
    936.16x = 667,206.30
  5. Step 5: Solve for x
    x = 667,206.30/936.16
  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.