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Finding the Fourth Proportional to 816.18, 1,224.41 and 405.33

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Solution

The fourth proportional to 816.18, 1,224.41 and 405.33 is: 608.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.18 : 1,224.41 = 405.33 : x
  2. Step 2: Convert to fraction form
    816.18/1,224.41 = 405.33/x
  3. Step 3: Cross multiply
    816.18x = 1,224.41 × 405.33
  4. Step 4: Simplify right side
    816.18x = 496,288.08
  5. Step 5: Solve for x
    x = 496,288.08/816.18
  6. Step 6: Final answer
    x = 608.06

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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.