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Finding the Fourth Proportional to 748.10, 1,121.76 and 285.54

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Solution

The fourth proportional to 748.10, 1,121.76 and 285.54 is: 428.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.10 : 1,121.76 = 285.54 : x
  2. Step 2: Convert to fraction form
    748.10/1,121.76 = 285.54/x
  3. Step 3: Cross multiply
    748.10x = 1,121.76 × 285.54
  4. Step 4: Simplify right side
    748.10x = 320,307.35
  5. Step 5: Solve for x
    x = 320,307.35/748.10
  6. Step 6: Final answer
    x = 428.16

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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.