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Finding the Third Proportional to 141,720 and 217,128

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Solution

The third proportional to 141,720 and 217,128 is: 332,659.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,720 : 217,128 = 217,128 : x
  2. Step 2: Convert to fraction form
    141,720/217,128 = 217,128/x
  3. Step 3: Cross multiply
    141,720x = 217,128 × 217,128
  4. Step 4: Simplify right side
    141,720x = 47,144,568,384
  5. Step 5: Solve for x
    x = 47,144,568,384/141,720
  6. Step 6: Final answer
    x = 332,659.95

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.