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Finding the Third Proportional to 259,687 and 391,240

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Solution

The third proportional to 259,687 and 391,240 is: 589,435.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,687 : 391,240 = 391,240 : x
  2. Step 2: Convert to fraction form
    259,687/391,240 = 391,240/x
  3. Step 3: Cross multiply
    259,687x = 391,240 × 391,240
  4. Step 4: Simplify right side
    259,687x = 153,068,737,600
  5. Step 5: Solve for x
    x = 153,068,737,600/259,687
  6. Step 6: Final answer
    x = 589,435.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.