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Finding the Fourth Proportional to 909.91, 1,255.66 and 517.06

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Solution

The fourth proportional to 909.91, 1,255.66 and 517.06 is: 713.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.91 : 1,255.66 = 517.06 : x
  2. Step 2: Convert to fraction form
    909.91/1,255.66 = 517.06/x
  3. Step 3: Cross multiply
    909.91x = 1,255.66 × 517.06
  4. Step 4: Simplify right side
    909.91x = 649,251.56
  5. Step 5: Solve for x
    x = 649,251.56/909.91
  6. Step 6: Final answer
    x = 713.53

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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.