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Finding the Fourth Proportional to 861.62, 1,189.04 and 488.59

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Solution

The fourth proportional to 861.62, 1,189.04 and 488.59 is: 674.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.62 : 1,189.04 = 488.59 : x
  2. Step 2: Convert to fraction form
    861.62/1,189.04 = 488.59/x
  3. Step 3: Cross multiply
    861.62x = 1,189.04 × 488.59
  4. Step 4: Simplify right side
    861.62x = 580,953.05
  5. Step 5: Solve for x
    x = 580,953.05/861.62
  6. Step 6: Final answer
    x = 674.26

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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.