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Finding the Third Proportional to 278,817 and 432,339

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Solution

The third proportional to 278,817 and 432,339 is: 670,393.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,817 : 432,339 = 432,339 : x
  2. Step 2: Convert to fraction form
    278,817/432,339 = 432,339/x
  3. Step 3: Cross multiply
    278,817x = 432,339 × 432,339
  4. Step 4: Simplify right side
    278,817x = 186,917,010,921
  5. Step 5: Solve for x
    x = 186,917,010,921/278,817
  6. Step 6: Final answer
    x = 670,393.16

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.