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Finding the Fourth Proportional to 1,138.21, 1,704.12 and 726.32

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Solution

The fourth proportional to 1,138.21, 1,704.12 and 726.32 is: 1,087.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.21 : 1,704.12 = 726.32 : x
  2. Step 2: Convert to fraction form
    1,138.21/1,704.12 = 726.32/x
  3. Step 3: Cross multiply
    1,138.21x = 1,704.12 × 726.32
  4. Step 4: Simplify right side
    1,138.21x = 1,237,736.44
  5. Step 5: Solve for x
    x = 1,237,736.44/1,138.21
  6. Step 6: Final answer
    x = 1,087.44

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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.