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Finding the Fourth Proportional to 818.33, 1,128.98 and 641.97

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Solution

The fourth proportional to 818.33, 1,128.98 and 641.97 is: 885.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.33 : 1,128.98 = 641.97 : x
  2. Step 2: Convert to fraction form
    818.33/1,128.98 = 641.97/x
  3. Step 3: Cross multiply
    818.33x = 1,128.98 × 641.97
  4. Step 4: Simplify right side
    818.33x = 724,772.90
  5. Step 5: Solve for x
    x = 724,772.90/818.33
  6. Step 6: Final answer
    x = 885.68

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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.