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Finding the Fourth Proportional to 748.55, 1,121.99 and 382.57

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Solution

The fourth proportional to 748.55, 1,121.99 and 382.57 is: 573.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.55 : 1,121.99 = 382.57 : x
  2. Step 2: Convert to fraction form
    748.55/1,121.99 = 382.57/x
  3. Step 3: Cross multiply
    748.55x = 1,121.99 × 382.57
  4. Step 4: Simplify right side
    748.55x = 429,235.00
  5. Step 5: Solve for x
    x = 429,235.00/748.55
  6. Step 6: Final answer
    x = 573.42

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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.