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Finding the Third Proportional to 285,876 and 420,498

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Solution

The third proportional to 285,876 and 420,498 is: 618,514.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,876 : 420,498 = 420,498 : x
  2. Step 2: Convert to fraction form
    285,876/420,498 = 420,498/x
  3. Step 3: Cross multiply
    285,876x = 420,498 × 420,498
  4. Step 4: Simplify right side
    285,876x = 176,818,568,004
  5. Step 5: Solve for x
    x = 176,818,568,004/285,876
  6. Step 6: Final answer
    x = 618,514.91

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.