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Finding the Fourth Proportional to 861.63, 1,185.08 and 803.31

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Solution

The fourth proportional to 861.63, 1,185.08 and 803.31 is: 1,104.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.63 : 1,185.08 = 803.31 : x
  2. Step 2: Convert to fraction form
    861.63/1,185.08 = 803.31/x
  3. Step 3: Cross multiply
    861.63x = 1,185.08 × 803.31
  4. Step 4: Simplify right side
    861.63x = 951,982.60
  5. Step 5: Solve for x
    x = 951,982.60/861.63
  6. Step 6: Final answer
    x = 1,104.86

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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.