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Finding the Fourth Proportional to 1,331.88, 1,996.02 and 681.72

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Solution

The fourth proportional to 1,331.88, 1,996.02 and 681.72 is: 1,021.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.88 : 1,996.02 = 681.72 : x
  2. Step 2: Convert to fraction form
    1,331.88/1,996.02 = 681.72/x
  3. Step 3: Cross multiply
    1,331.88x = 1,996.02 × 681.72
  4. Step 4: Simplify right side
    1,331.88x = 1,360,726.75
  5. Step 5: Solve for x
    x = 1,360,726.75/1,331.88
  6. Step 6: Final answer
    x = 1,021.66

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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.