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Finding the Fourth Proportional to 936.39, 1,292.22 and 516.75

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Solution

The fourth proportional to 936.39, 1,292.22 and 516.75 is: 713.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.39 : 1,292.22 = 516.75 : x
  2. Step 2: Convert to fraction form
    936.39/1,292.22 = 516.75/x
  3. Step 3: Cross multiply
    936.39x = 1,292.22 × 516.75
  4. Step 4: Simplify right side
    936.39x = 667,754.69
  5. Step 5: Solve for x
    x = 667,754.69/936.39
  6. Step 6: Final answer
    x = 713.12

Related Problems

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Half scale
Find fourth proportional to 1,872.78, 2,584.44 and 1,033.50
Double scale
Find fourth proportional to 937.39, 1,293.60 and 517.75
Similar ratio
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1.5x scale

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.