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Finding the Fourth Proportional to 2,169.36, 3,252.56 and 781.97

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Solution

The fourth proportional to 2,169.36, 3,252.56 and 781.97 is: 1,172.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,169.36 : 3,252.56 = 781.97 : x
  2. Step 2: Convert to fraction form
    2,169.36/3,252.56 = 781.97/x
  3. Step 3: Cross multiply
    2,169.36x = 3,252.56 × 781.97
  4. Step 4: Simplify right side
    2,169.36x = 2,543,384.17
  5. Step 5: Solve for x
    x = 2,543,384.17/2,169.36
  6. Step 6: Final answer
    x = 1,172.41

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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.