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Finding the Fourth Proportional to 817.34, 1,225.99 and 330.38

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Solution

The fourth proportional to 817.34, 1,225.99 and 330.38 is: 495.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.34 : 1,225.99 = 330.38 : x
  2. Step 2: Convert to fraction form
    817.34/1,225.99 = 330.38/x
  3. Step 3: Cross multiply
    817.34x = 1,225.99 × 330.38
  4. Step 4: Simplify right side
    817.34x = 405,042.58
  5. Step 5: Solve for x
    x = 405,042.58/817.34
  6. Step 6: Final answer
    x = 495.56

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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.