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Finding the Fourth Proportional to 748.08, 1,121.76 and 285.72

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Solution

The fourth proportional to 748.08, 1,121.76 and 285.72 is: 428.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.08 : 1,121.76 = 285.72 : x
  2. Step 2: Convert to fraction form
    748.08/1,121.76 = 285.72/x
  3. Step 3: Cross multiply
    748.08x = 1,121.76 × 285.72
  4. Step 4: Simplify right side
    748.08x = 320,509.27
  5. Step 5: Solve for x
    x = 320,509.27/748.08
  6. Step 6: Final answer
    x = 428.44

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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.