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Finding the Fourth Proportional to 861.98, 1,189.33 and 488.88

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Solution

The fourth proportional to 861.98, 1,189.33 and 488.88 is: 674.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.98 : 1,189.33 = 488.88 : x
  2. Step 2: Convert to fraction form
    861.98/1,189.33 = 488.88/x
  3. Step 3: Cross multiply
    861.98x = 1,189.33 × 488.88
  4. Step 4: Simplify right side
    861.98x = 581,433.70
  5. Step 5: Solve for x
    x = 581,433.70/861.98
  6. Step 6: Final answer
    x = 674.53

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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.