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Finding the Fourth Proportional to 768.38, 1,152.56 and 220.48

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Solution

The fourth proportional to 768.38, 1,152.56 and 220.48 is: 330.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.38 : 1,152.56 = 220.48 : x
  2. Step 2: Convert to fraction form
    768.38/1,152.56 = 220.48/x
  3. Step 3: Cross multiply
    768.38x = 1,152.56 × 220.48
  4. Step 4: Simplify right side
    768.38x = 254,114.10
  5. Step 5: Solve for x
    x = 254,114.10/768.38
  6. Step 6: Final answer
    x = 330.72

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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.