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Finding the Fourth Proportional to 681.21, 1,021.82 and 248.13

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Solution

The fourth proportional to 681.21, 1,021.82 and 248.13 is: 372.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.21 : 1,021.82 = 248.13 : x
  2. Step 2: Convert to fraction form
    681.21/1,021.82 = 248.13/x
  3. Step 3: Cross multiply
    681.21x = 1,021.82 × 248.13
  4. Step 4: Simplify right side
    681.21x = 253,542.96
  5. Step 5: Solve for x
    x = 253,542.96/681.21
  6. Step 6: Final answer
    x = 372.20

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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.