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Finding the Third Proportional to 638,740 and 1,390,879

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Solution

The third proportional to 638,740 and 1,390,879 is: 3,028,688.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,740 : 1,390,879 = 1,390,879 : x
  2. Step 2: Convert to fraction form
    638,740/1,390,879 = 1,390,879/x
  3. Step 3: Cross multiply
    638,740x = 1,390,879 × 1,390,879
  4. Step 4: Simplify right side
    638,740x = 1,934,544,392,641
  5. Step 5: Solve for x
    x = 1,934,544,392,641/638,740
  6. Step 6: Final answer
    x = 3,028,688.34

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.