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Finding the Third Proportional to 554.34 and 861.47

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Solution

The third proportional to 554.34 and 861.47 is: 1,338.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.34 : 861.47 = 861.47 : x
  2. Step 2: Convert to fraction form
    554.34/861.47 = 861.47/x
  3. Step 3: Cross multiply
    554.34x = 861.47 × 861.47
  4. Step 4: Simplify right side
    554.34x = 742,128.41
  5. Step 5: Solve for x
    x = 742,128.41/554.34
  6. Step 6: Final answer
    x = 1,338.75

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.