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Finding the Third Proportional to 391,556 and 622,342

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Solution

The third proportional to 391,556 and 622,342 is: 989,154.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,556 : 622,342 = 622,342 : x
  2. Step 2: Convert to fraction form
    391,556/622,342 = 622,342/x
  3. Step 3: Cross multiply
    391,556x = 622,342 × 622,342
  4. Step 4: Simplify right side
    391,556x = 387,309,564,964
  5. Step 5: Solve for x
    x = 387,309,564,964/391,556
  6. Step 6: Final answer
    x = 989,154.97

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.