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Finding the Fourth Proportional to 748.33, 1,121.58 and 422.71

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Solution

The fourth proportional to 748.33, 1,121.58 and 422.71 is: 633.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.33 : 1,121.58 = 422.71 : x
  2. Step 2: Convert to fraction form
    748.33/1,121.58 = 422.71/x
  3. Step 3: Cross multiply
    748.33x = 1,121.58 × 422.71
  4. Step 4: Simplify right side
    748.33x = 474,100.28
  5. Step 5: Solve for x
    x = 474,100.28/748.33
  6. Step 6: Final answer
    x = 633.55

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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.