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Finding the Fourth Proportional to 817.06, 1,225.56 and 329.80

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Solution

The fourth proportional to 817.06, 1,225.56 and 329.80 is: 494.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.06 : 1,225.56 = 329.80 : x
  2. Step 2: Convert to fraction form
    817.06/1,225.56 = 329.80/x
  3. Step 3: Cross multiply
    817.06x = 1,225.56 × 329.80
  4. Step 4: Simplify right side
    817.06x = 404,189.69
  5. Step 5: Solve for x
    x = 404,189.69/817.06
  6. Step 6: Final answer
    x = 494.69

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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.