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Finding the Fourth Proportional to 768.20, 1,152.75 and 281.30

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Solution

The fourth proportional to 768.20, 1,152.75 and 281.30 is: 422.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.20 : 1,152.75 = 281.30 : x
  2. Step 2: Convert to fraction form
    768.20/1,152.75 = 281.30/x
  3. Step 3: Cross multiply
    768.20x = 1,152.75 × 281.30
  4. Step 4: Simplify right side
    768.20x = 324,262.81
  5. Step 5: Solve for x
    x = 324,262.81/768.20
  6. Step 6: Final answer
    x = 422.11

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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.