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Finding the Fourth Proportional to 817.31, 1,224.43 and 405.96

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Solution

The fourth proportional to 817.31, 1,224.43 and 405.96 is: 608.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.31 : 1,224.43 = 405.96 : x
  2. Step 2: Convert to fraction form
    817.31/1,224.43 = 405.96/x
  3. Step 3: Cross multiply
    817.31x = 1,224.43 × 405.96
  4. Step 4: Simplify right side
    817.31x = 497,073.18
  5. Step 5: Solve for x
    x = 497,073.18/817.31
  6. Step 6: Final answer
    x = 608.18

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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.