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Finding the Third Proportional to 294,980 and 643,540

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Solution

The third proportional to 294,980 and 643,540 is: 1,403,972.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    294,980 : 643,540 = 643,540 : x
  2. Step 2: Convert to fraction form
    294,980/643,540 = 643,540/x
  3. Step 3: Cross multiply
    294,980x = 643,540 × 643,540
  4. Step 4: Simplify right side
    294,980x = 414,143,731,600
  5. Step 5: Solve for x
    x = 414,143,731,600/294,980
  6. Step 6: Final answer
    x = 1,403,972.24

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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.