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Finding the Third Proportional to 210,689 and 391,489

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Solution

The third proportional to 210,689 and 391,489 is: 727,440.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,689 : 391,489 = 391,489 : x
  2. Step 2: Convert to fraction form
    210,689/391,489 = 391,489/x
  3. Step 3: Cross multiply
    210,689x = 391,489 × 391,489
  4. Step 4: Simplify right side
    210,689x = 153,263,637,121
  5. Step 5: Solve for x
    x = 153,263,637,121/210,689
  6. Step 6: Final answer
    x = 727,440.15

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.