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Finding the Third Proportional to 413,172 and 638,442

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Solution

The third proportional to 413,172 and 638,442 is: 986,533.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    413,172 : 638,442 = 638,442 : x
  2. Step 2: Convert to fraction form
    413,172/638,442 = 638,442/x
  3. Step 3: Cross multiply
    413,172x = 638,442 × 638,442
  4. Step 4: Simplify right side
    413,172x = 407,608,187,364
  5. Step 5: Solve for x
    x = 407,608,187,364/413,172
  6. Step 6: Final answer
    x = 986,533.91

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.