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Finding the Third Proportional to 390,486 and 791,838

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Solution

The third proportional to 390,486 and 791,838 is: 1,605,710.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,486 : 791,838 = 791,838 : x
  2. Step 2: Convert to fraction form
    390,486/791,838 = 791,838/x
  3. Step 3: Cross multiply
    390,486x = 791,838 × 791,838
  4. Step 4: Simplify right side
    390,486x = 627,007,418,244
  5. Step 5: Solve for x
    x = 627,007,418,244/390,486
  6. Step 6: Final answer
    x = 1,605,710.37

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.