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Finding the Fourth Proportional to 3,153.36, 4,729.97 and 781.41

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Solution

The fourth proportional to 3,153.36, 4,729.97 and 781.41 is: 1,172.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,153.36 : 4,729.97 = 781.41 : x
  2. Step 2: Convert to fraction form
    3,153.36/4,729.97 = 781.41/x
  3. Step 3: Cross multiply
    3,153.36x = 4,729.97 × 781.41
  4. Step 4: Simplify right side
    3,153.36x = 3,696,018.30
  5. Step 5: Solve for x
    x = 3,696,018.30/3,153.36
  6. Step 6: Final answer
    x = 1,172.09

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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.