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Finding the Third Proportional to 400.55 and 861.84

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Solution

The third proportional to 400.55 and 861.84 is: 1,854.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.55 : 861.84 = 861.84 : x
  2. Step 2: Convert to fraction form
    400.55/861.84 = 861.84/x
  3. Step 3: Cross multiply
    400.55x = 861.84 × 861.84
  4. Step 4: Simplify right side
    400.55x = 742,774.65
  5. Step 5: Solve for x
    x = 742,774.65/400.55
  6. Step 6: Final answer
    x = 1,854.40

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.