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Finding the Third Proportional to 218,421 and 329,636.25

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Solution

The third proportional to 218,421 and 329,636.25 is: 497,479.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,421 : 329,636.25 = 329,636.25 : x
  2. Step 2: Convert to fraction form
    218,421/329,636.25 = 329,636.25/x
  3. Step 3: Cross multiply
    218,421x = 329,636.25 × 329,636.25
  4. Step 4: Simplify right side
    218,421x = 108,660,057,314.06
  5. Step 5: Solve for x
    x = 108,660,057,314.06/218,421
  6. Step 6: Final answer
    x = 497,479.90

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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.