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Finding the Fourth Proportional to 861.36, 1,286.28 and 676.68

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Solution

The fourth proportional to 861.36, 1,286.28 and 676.68 is: 1,010.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.36 : 1,286.28 = 676.68 : x
  2. Step 2: Convert to fraction form
    861.36/1,286.28 = 676.68/x
  3. Step 3: Cross multiply
    861.36x = 1,286.28 × 676.68
  4. Step 4: Simplify right side
    861.36x = 870,399.95
  5. Step 5: Solve for x
    x = 870,399.95/861.36
  6. Step 6: Final answer
    x = 1,010.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.