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Finding the Fourth Proportional to 817.65, 1,225.94 and 330.57

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Solution

The fourth proportional to 817.65, 1,225.94 and 330.57 is: 495.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.65 : 1,225.94 = 330.57 : x
  2. Step 2: Convert to fraction form
    817.65/1,225.94 = 330.57/x
  3. Step 3: Cross multiply
    817.65x = 1,225.94 × 330.57
  4. Step 4: Simplify right side
    817.65x = 405,257.33
  5. Step 5: Solve for x
    x = 405,257.33/817.65
  6. Step 6: Final answer
    x = 495.64

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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.