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Finding the Fourth Proportional to 724.21, 999.17 and 409.43

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Solution

The fourth proportional to 724.21, 999.17 and 409.43 is: 564.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.21 : 999.17 = 409.43 : x
  2. Step 2: Convert to fraction form
    724.21/999.17 = 409.43/x
  3. Step 3: Cross multiply
    724.21x = 999.17 × 409.43
  4. Step 4: Simplify right side
    724.21x = 409,090.17
  5. Step 5: Solve for x
    x = 409,090.17/724.21
  6. Step 6: Final answer
    x = 564.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.