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Finding the Fourth Proportional to 681.80, 1,022.78 and 392.84

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Solution

The fourth proportional to 681.80, 1,022.78 and 392.84 is: 589.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.80 : 1,022.78 = 392.84 : x
  2. Step 2: Convert to fraction form
    681.80/1,022.78 = 392.84/x
  3. Step 3: Cross multiply
    681.80x = 1,022.78 × 392.84
  4. Step 4: Simplify right side
    681.80x = 401,788.90
  5. Step 5: Solve for x
    x = 401,788.90/681.80
  6. Step 6: Final answer
    x = 589.31

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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.