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Finding the Third Proportional to 289,993.50 and 638,779.50

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Solution

The third proportional to 289,993.50 and 638,779.50 is: 1,407,063.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,993.50 : 638,779.50 = 638,779.50 : x
  2. Step 2: Convert to fraction form
    289,993.50/638,779.50 = 638,779.50/x
  3. Step 3: Cross multiply
    289,993.50x = 638,779.50 × 638,779.50
  4. Step 4: Simplify right side
    289,993.50x = 408,039,249,620.25
  5. Step 5: Solve for x
    x = 408,039,249,620.25/289,993.50
  6. Step 6: Final answer
    x = 1,407,063.43

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.