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Finding the Third Proportional to 257,491 and 393,896

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Solution

The third proportional to 257,491 and 393,896 is: 602,561.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,491 : 393,896 = 393,896 : x
  2. Step 2: Convert to fraction form
    257,491/393,896 = 393,896/x
  3. Step 3: Cross multiply
    257,491x = 393,896 × 393,896
  4. Step 4: Simplify right side
    257,491x = 155,154,058,816
  5. Step 5: Solve for x
    x = 155,154,058,816/257,491
  6. Step 6: Final answer
    x = 602,561.09

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.