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Finding the Third Proportional to 558.56 and 1,221.19

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Solution

The third proportional to 558.56 and 1,221.19 is: 2,669.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.56 : 1,221.19 = 1,221.19 : x
  2. Step 2: Convert to fraction form
    558.56/1,221.19 = 1,221.19/x
  3. Step 3: Cross multiply
    558.56x = 1,221.19 × 1,221.19
  4. Step 4: Simplify right side
    558.56x = 1,491,298.91
  5. Step 5: Solve for x
    x = 1,491,298.91/558.56
  6. Step 6: Final answer
    x = 2,669.89

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.