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Finding the Fourth Proportional to 748.36, 1,122.62 and 261.28

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Solution

The fourth proportional to 748.36, 1,122.62 and 261.28 is: 391.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.36 : 1,122.62 = 261.28 : x
  2. Step 2: Convert to fraction form
    748.36/1,122.62 = 261.28/x
  3. Step 3: Cross multiply
    748.36x = 1,122.62 × 261.28
  4. Step 4: Simplify right side
    748.36x = 293,318.15
  5. Step 5: Solve for x
    x = 293,318.15/748.36
  6. Step 6: Final answer
    x = 391.95

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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.