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Finding the Fourth Proportional to 910.26, 1,255.98 and 517.20

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Solution

The fourth proportional to 910.26, 1,255.98 and 517.20 is: 713.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.26 : 1,255.98 = 517.20 : x
  2. Step 2: Convert to fraction form
    910.26/1,255.98 = 517.20/x
  3. Step 3: Cross multiply
    910.26x = 1,255.98 × 517.20
  4. Step 4: Simplify right side
    910.26x = 649,592.86
  5. Step 5: Solve for x
    x = 649,592.86/910.26
  6. Step 6: Final answer
    x = 713.63

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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.