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Finding the Fourth Proportional to 910.12, 1,255.80 and 517.08

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Solution

The fourth proportional to 910.12, 1,255.80 and 517.08 is: 713.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.12 : 1,255.80 = 517.08 : x
  2. Step 2: Convert to fraction form
    910.12/1,255.80 = 517.08/x
  3. Step 3: Cross multiply
    910.12x = 1,255.80 × 517.08
  4. Step 4: Simplify right side
    910.12x = 649,349.06
  5. Step 5: Solve for x
    x = 649,349.06/910.12
  6. Step 6: Final answer
    x = 713.48

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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.