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Finding the Third Proportional to 243,279 and 388,638

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Solution

The third proportional to 243,279 and 388,638 is: 620,848.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,279 : 388,638 = 388,638 : x
  2. Step 2: Convert to fraction form
    243,279/388,638 = 388,638/x
  3. Step 3: Cross multiply
    243,279x = 388,638 × 388,638
  4. Step 4: Simplify right side
    243,279x = 151,039,495,044
  5. Step 5: Solve for x
    x = 151,039,495,044/243,279
  6. Step 6: Final answer
    x = 620,848.88

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.