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Finding the Fourth Proportional to 769.15, 1,153.91 and 221.33

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Solution

The fourth proportional to 769.15, 1,153.91 and 221.33 is: 332.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.15 : 1,153.91 = 221.33 : x
  2. Step 2: Convert to fraction form
    769.15/1,153.91 = 221.33/x
  3. Step 3: Cross multiply
    769.15x = 1,153.91 × 221.33
  4. Step 4: Simplify right side
    769.15x = 255,394.90
  5. Step 5: Solve for x
    x = 255,394.90/769.15
  6. Step 6: Final answer
    x = 332.05

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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.