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Finding the Fourth Proportional to 861.85, 1,189.47 and 488.92

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Solution

The fourth proportional to 861.85, 1,189.47 and 488.92 is: 674.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.85 : 1,189.47 = 488.92 : x
  2. Step 2: Convert to fraction form
    861.85/1,189.47 = 488.92/x
  3. Step 3: Cross multiply
    861.85x = 1,189.47 × 488.92
  4. Step 4: Simplify right side
    861.85x = 581,556.89
  5. Step 5: Solve for x
    x = 581,556.89/861.85
  6. Step 6: Final answer
    x = 674.78

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1.5x scale

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.