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Finding the Fourth Proportional to 681.90, 1,022.80 and 271.38

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Solution

The fourth proportional to 681.90, 1,022.80 and 271.38 is: 407.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.90 : 1,022.80 = 271.38 : x
  2. Step 2: Convert to fraction form
    681.90/1,022.80 = 271.38/x
  3. Step 3: Cross multiply
    681.90x = 1,022.80 × 271.38
  4. Step 4: Simplify right side
    681.90x = 277,567.46
  5. Step 5: Solve for x
    x = 277,567.46/681.90
  6. Step 6: Final answer
    x = 407.05

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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.