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Finding the Fourth Proportional to 861.75, 1,294.20 and 789.47

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Solution

The fourth proportional to 861.75, 1,294.20 and 789.47 is: 1,185.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.75 : 1,294.20 = 789.47 : x
  2. Step 2: Convert to fraction form
    861.75/1,294.20 = 789.47/x
  3. Step 3: Cross multiply
    861.75x = 1,294.20 × 789.47
  4. Step 4: Simplify right side
    861.75x = 1,021,725.60
  5. Step 5: Solve for x
    x = 1,021,725.60/861.75
  6. Step 6: Final answer
    x = 1,185.64

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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.