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Finding the Fourth Proportional to 818.08, 1,227.60 and 656.80

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Solution

The fourth proportional to 818.08, 1,227.60 and 656.80 is: 985.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.08 : 1,227.60 = 656.80 : x
  2. Step 2: Convert to fraction form
    818.08/1,227.60 = 656.80/x
  3. Step 3: Cross multiply
    818.08x = 1,227.60 × 656.80
  4. Step 4: Simplify right side
    818.08x = 806,287.68
  5. Step 5: Solve for x
    x = 806,287.68/818.08
  6. Step 6: Final answer
    x = 985.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.