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Finding the Fourth Proportional to 681.44, 1,021.20 and 392.28

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Solution

The fourth proportional to 681.44, 1,021.20 and 392.28 is: 587.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.44 : 1,021.20 = 392.28 : x
  2. Step 2: Convert to fraction form
    681.44/1,021.20 = 392.28/x
  3. Step 3: Cross multiply
    681.44x = 1,021.20 × 392.28
  4. Step 4: Simplify right side
    681.44x = 400,596.34
  5. Step 5: Solve for x
    x = 400,596.34/681.44
  6. Step 6: Final answer
    x = 587.87

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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.