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Finding the Fourth Proportional to 817.56, 1,225.28 and 330.35

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Solution

The fourth proportional to 817.56, 1,225.28 and 330.35 is: 495.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.56 : 1,225.28 = 330.35 : x
  2. Step 2: Convert to fraction form
    817.56/1,225.28 = 330.35/x
  3. Step 3: Cross multiply
    817.56x = 1,225.28 × 330.35
  4. Step 4: Simplify right side
    817.56x = 404,764.09
  5. Step 5: Solve for x
    x = 404,764.09/817.56
  6. Step 6: Final answer
    x = 495.09

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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.