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Finding the Third Proportional to 178,721 and 276,479

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Solution

The third proportional to 178,721 and 276,479 is: 427,709.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    178,721 : 276,479 = 276,479 : x
  2. Step 2: Convert to fraction form
    178,721/276,479 = 276,479/x
  3. Step 3: Cross multiply
    178,721x = 276,479 × 276,479
  4. Step 4: Simplify right side
    178,721x = 76,440,637,441
  5. Step 5: Solve for x
    x = 76,440,637,441/178,721
  6. Step 6: Final answer
    x = 427,709.32

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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.