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Finding the Fourth Proportional to 769.43, 1,153.95 and 330.67

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Solution

The fourth proportional to 769.43, 1,153.95 and 330.67 is: 495.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.43 : 1,153.95 = 330.67 : x
  2. Step 2: Convert to fraction form
    769.43/1,153.95 = 330.67/x
  3. Step 3: Cross multiply
    769.43x = 1,153.95 × 330.67
  4. Step 4: Simplify right side
    769.43x = 381,570.36
  5. Step 5: Solve for x
    x = 381,570.36/769.43
  6. Step 6: Final answer
    x = 495.91

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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.