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Finding the Fourth Proportional to 748.96, 1,121.92 and 423.64

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Solution

The fourth proportional to 748.96, 1,121.92 and 423.64 is: 634.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.96 : 1,121.92 = 423.64 : x
  2. Step 2: Convert to fraction form
    748.96/1,121.92 = 423.64/x
  3. Step 3: Cross multiply
    748.96x = 1,121.92 × 423.64
  4. Step 4: Simplify right side
    748.96x = 475,290.19
  5. Step 5: Solve for x
    x = 475,290.19/748.96
  6. Step 6: Final answer
    x = 634.60

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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.