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Finding the Fourth Proportional to 909.91, 1,255.63 and 516.92

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Solution

The fourth proportional to 909.91, 1,255.63 and 516.92 is: 713.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.91 : 1,255.63 = 516.92 : x
  2. Step 2: Convert to fraction form
    909.91/1,255.63 = 516.92/x
  3. Step 3: Cross multiply
    909.91x = 1,255.63 × 516.92
  4. Step 4: Simplify right side
    909.91x = 649,059.27
  5. Step 5: Solve for x
    x = 649,059.27/909.91
  6. Step 6: Final answer
    x = 713.33

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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.