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Finding the Third Proportional to 557 and 1,223

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Solution

The third proportional to 557 and 1,223 is: 2,685.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    557 : 1,223 = 1,223 : x
  2. Step 2: Convert to fraction form
    557/1,223 = 1,223/x
  3. Step 3: Cross multiply
    557x = 1,223 × 1,223
  4. Step 4: Simplify right side
    557x = 1,495,729
  5. Step 5: Solve for x
    x = 1,495,729/557
  6. Step 6: Final answer
    x = 2,685.33

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.