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Finding the Fourth Proportional to 902.82, 1,246.05 and 861.78

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Solution

The fourth proportional to 902.82, 1,246.05 and 861.78 is: 1,189.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.82 : 1,246.05 = 861.78 : x
  2. Step 2: Convert to fraction form
    902.82/1,246.05 = 861.78/x
  3. Step 3: Cross multiply
    902.82x = 1,246.05 × 861.78
  4. Step 4: Simplify right side
    902.82x = 1,073,820.97
  5. Step 5: Solve for x
    x = 1,073,820.97/902.82
  6. Step 6: Final answer
    x = 1,189.41

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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.