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Finding the Third Proportional to 243 and 657

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Solution

The third proportional to 243 and 657 is: 1,776.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    243 : 657 = 657 : x
  2. Step 2: Convert to fraction form
    243/657 = 657/x
  3. Step 3: Cross multiply
    243x = 657 × 657
  4. Step 4: Simplify right side
    243x = 431,649
  5. Step 5: Solve for x
    x = 431,649/243
  6. Step 6: Final answer
    x = 1,776.33

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Why These Related Problems?

These problems maintain the same ratio (2.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.