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Finding the Fourth Proportional to 681.27, 1,021.86 and 393.36

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Solution

The fourth proportional to 681.27, 1,021.86 and 393.36 is: 590.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.27 : 1,021.86 = 393.36 : x
  2. Step 2: Convert to fraction form
    681.27/1,021.86 = 393.36/x
  3. Step 3: Cross multiply
    681.27x = 1,021.86 × 393.36
  4. Step 4: Simplify right side
    681.27x = 401,958.85
  5. Step 5: Solve for x
    x = 401,958.85/681.27
  6. Step 6: Final answer
    x = 590.01

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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.