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Finding the Third Proportional to 390,412 and 814,712

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Solution

The third proportional to 390,412 and 814,712 is: 1,700,141.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,412 : 814,712 = 814,712 : x
  2. Step 2: Convert to fraction form
    390,412/814,712 = 814,712/x
  3. Step 3: Cross multiply
    390,412x = 814,712 × 814,712
  4. Step 4: Simplify right side
    390,412x = 663,755,642,944
  5. Step 5: Solve for x
    x = 663,755,642,944/390,412
  6. Step 6: Final answer
    x = 1,700,141.50

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.