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Finding the Fourth Proportional to 748.14, 1,121.42 and 285.62

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Solution

The fourth proportional to 748.14, 1,121.42 and 285.62 is: 428.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.14 : 1,121.42 = 285.62 : x
  2. Step 2: Convert to fraction form
    748.14/1,121.42 = 285.62/x
  3. Step 3: Cross multiply
    748.14x = 1,121.42 × 285.62
  4. Step 4: Simplify right side
    748.14x = 320,299.98
  5. Step 5: Solve for x
    x = 320,299.98/748.14
  6. Step 6: Final answer
    x = 428.13

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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.