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Finding the Fourth Proportional to 861.03, 1,285.71 and 676.35

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Solution

The fourth proportional to 861.03, 1,285.71 and 676.35 is: 1,009.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.03 : 1,285.71 = 676.35 : x
  2. Step 2: Convert to fraction form
    861.03/1,285.71 = 676.35/x
  3. Step 3: Cross multiply
    861.03x = 1,285.71 × 676.35
  4. Step 4: Simplify right side
    861.03x = 869,587.42
  5. Step 5: Solve for x
    x = 869,587.42/861.03
  6. Step 6: Final answer
    x = 1,009.94

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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.