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Finding the Fourth Proportional to 723.99, 998.87 and 409.22

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Solution

The fourth proportional to 723.99, 998.87 and 409.22 is: 564.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.99 : 998.87 = 409.22 : x
  2. Step 2: Convert to fraction form
    723.99/998.87 = 409.22/x
  3. Step 3: Cross multiply
    723.99x = 998.87 × 409.22
  4. Step 4: Simplify right side
    723.99x = 408,756.27
  5. Step 5: Solve for x
    x = 408,756.27/723.99
  6. Step 6: Final answer
    x = 564.59

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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.