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Finding the Third Proportional to 290,457 and 638,190

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Solution

The third proportional to 290,457 and 638,190 is: 1,402,226.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,457 : 638,190 = 638,190 : x
  2. Step 2: Convert to fraction form
    290,457/638,190 = 638,190/x
  3. Step 3: Cross multiply
    290,457x = 638,190 × 638,190
  4. Step 4: Simplify right side
    290,457x = 407,286,476,100
  5. Step 5: Solve for x
    x = 407,286,476,100/290,457
  6. Step 6: Final answer
    x = 1,402,226.41

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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.