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Finding the Third Proportional to 690.75 and 1,242

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Solution

The third proportional to 690.75 and 1,242 is: 2,233.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.75 : 1,242 = 1,242 : x
  2. Step 2: Convert to fraction form
    690.75/1,242 = 1,242/x
  3. Step 3: Cross multiply
    690.75x = 1,242 × 1,242
  4. Step 4: Simplify right side
    690.75x = 1,542,564
  5. Step 5: Solve for x
    x = 1,542,564/690.75
  6. Step 6: Final answer
    x = 2,233.17

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.