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Finding the Fourth Proportional to 768.72, 1,152.72 and 281.52

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Solution

The fourth proportional to 768.72, 1,152.72 and 281.52 is: 422.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.72 : 1,152.72 = 281.52 : x
  2. Step 2: Convert to fraction form
    768.72/1,152.72 = 281.52/x
  3. Step 3: Cross multiply
    768.72x = 1,152.72 × 281.52
  4. Step 4: Simplify right side
    768.72x = 324,513.73
  5. Step 5: Solve for x
    x = 324,513.73/768.72
  6. Step 6: Final answer
    x = 422.15

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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.