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Finding the Fourth Proportional to 681.78, 1,021.96 and 270.76

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Solution

The fourth proportional to 681.78, 1,021.96 and 270.76 is: 405.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.78 : 1,021.96 = 270.76 : x
  2. Step 2: Convert to fraction form
    681.78/1,021.96 = 270.76/x
  3. Step 3: Cross multiply
    681.78x = 1,021.96 × 270.76
  4. Step 4: Simplify right side
    681.78x = 276,705.89
  5. Step 5: Solve for x
    x = 276,705.89/681.78
  6. Step 6: Final answer
    x = 405.86

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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.