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Finding the Fourth Proportional to 816.23, 1,224.95 and 329.28

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Solution

The fourth proportional to 816.23, 1,224.95 and 329.28 is: 494.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.23 : 1,224.95 = 329.28 : x
  2. Step 2: Convert to fraction form
    816.23/1,224.95 = 329.28/x
  3. Step 3: Cross multiply
    816.23x = 1,224.95 × 329.28
  4. Step 4: Simplify right side
    816.23x = 403,349.89
  5. Step 5: Solve for x
    x = 403,349.89/816.23
  6. Step 6: Final answer
    x = 494.17

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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.