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Finding the Third Proportional to 242 and 400.75

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Solution

The third proportional to 242 and 400.75 is: 663.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    242 : 400.75 = 400.75 : x
  2. Step 2: Convert to fraction form
    242/400.75 = 400.75/x
  3. Step 3: Cross multiply
    242x = 400.75 × 400.75
  4. Step 4: Simplify right side
    242x = 160,600.56
  5. Step 5: Solve for x
    x = 160,600.56/242
  6. Step 6: Final answer
    x = 663.64

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.