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Finding the Fourth Proportional to 681.24, 939.90 and 445.43

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Solution

The fourth proportional to 681.24, 939.90 and 445.43 is: 614.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.24 : 939.90 = 445.43 : x
  2. Step 2: Convert to fraction form
    681.24/939.90 = 445.43/x
  3. Step 3: Cross multiply
    681.24x = 939.90 × 445.43
  4. Step 4: Simplify right side
    681.24x = 418,663.68
  5. Step 5: Solve for x
    x = 418,663.68/681.24
  6. Step 6: Final answer
    x = 614.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.