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Finding the Fourth Proportional to 681.33, 1,023.62 and 392.97

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Solution

The fourth proportional to 681.33, 1,023.62 and 392.97 is: 590.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.33 : 1,023.62 = 392.97 : x
  2. Step 2: Convert to fraction form
    681.33/1,023.62 = 392.97/x
  3. Step 3: Cross multiply
    681.33x = 1,023.62 × 392.97
  4. Step 4: Simplify right side
    681.33x = 402,249.99
  5. Step 5: Solve for x
    x = 402,249.99/681.33
  6. Step 6: Final answer
    x = 590.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.