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Finding the Fourth Proportional to 681.79, 1,022.76 and 271.21

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Solution

The fourth proportional to 681.79, 1,022.76 and 271.21 is: 406.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.79 : 1,022.76 = 271.21 : x
  2. Step 2: Convert to fraction form
    681.79/1,022.76 = 271.21/x
  3. Step 3: Cross multiply
    681.79x = 1,022.76 × 271.21
  4. Step 4: Simplify right side
    681.79x = 277,382.74
  5. Step 5: Solve for x
    x = 277,382.74/681.79
  6. Step 6: Final answer
    x = 406.84

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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.