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Finding the Fourth Proportional to 769.02, 1,153.50 and 221.20

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Solution

The fourth proportional to 769.02, 1,153.50 and 221.20 is: 331.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.02 : 1,153.50 = 221.20 : x
  2. Step 2: Convert to fraction form
    769.02/1,153.50 = 221.20/x
  3. Step 3: Cross multiply
    769.02x = 1,153.50 × 221.20
  4. Step 4: Simplify right side
    769.02x = 255,154.20
  5. Step 5: Solve for x
    x = 255,154.20/769.02
  6. Step 6: Final answer
    x = 331.79

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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.