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Finding the Fourth Proportional to 768.70, 1,152.97 and 220.87

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Solution

The fourth proportional to 768.70, 1,152.97 and 220.87 is: 331.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.70 : 1,152.97 = 220.87 : x
  2. Step 2: Convert to fraction form
    768.70/1,152.97 = 220.87/x
  3. Step 3: Cross multiply
    768.70x = 1,152.97 × 220.87
  4. Step 4: Simplify right side
    768.70x = 254,656.48
  5. Step 5: Solve for x
    x = 254,656.48/768.70
  6. Step 6: Final answer
    x = 331.28

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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.