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Finding the Third Proportional to 438,398 and 643,769

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Solution

The third proportional to 438,398 and 643,769 is: 945,347.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,398 : 643,769 = 643,769 : x
  2. Step 2: Convert to fraction form
    438,398/643,769 = 643,769/x
  3. Step 3: Cross multiply
    438,398x = 643,769 × 643,769
  4. Step 4: Simplify right side
    438,398x = 414,438,525,361
  5. Step 5: Solve for x
    x = 414,438,525,361/438,398
  6. Step 6: Final answer
    x = 945,347.66

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.