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Finding the Third Proportional to 218,479 and 329,724

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Solution

The third proportional to 218,479 and 329,724 is: 497,612.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,479 : 329,724 = 329,724 : x
  2. Step 2: Convert to fraction form
    218,479/329,724 = 329,724/x
  3. Step 3: Cross multiply
    218,479x = 329,724 × 329,724
  4. Step 4: Simplify right side
    218,479x = 108,717,916,176
  5. Step 5: Solve for x
    x = 108,717,916,176/218,479
  6. Step 6: Final answer
    x = 497,612.66

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.