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Finding the Fourth Proportional to 936.03, 1,291.80 and 516.42

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Solution

The fourth proportional to 936.03, 1,291.80 and 516.42 is: 712.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.03 : 1,291.80 = 516.42 : x
  2. Step 2: Convert to fraction form
    936.03/1,291.80 = 516.42/x
  3. Step 3: Cross multiply
    936.03x = 1,291.80 × 516.42
  4. Step 4: Simplify right side
    936.03x = 667,108.77
  5. Step 5: Solve for x
    x = 667,108.77/936.03
  6. Step 6: Final answer
    x = 712.70

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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.