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Finding the Fourth Proportional to 723.79, 998.83 and 409.05

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Solution

The fourth proportional to 723.79, 998.83 and 409.05 is: 564.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.79 : 998.83 = 409.05 : x
  2. Step 2: Convert to fraction form
    723.79/998.83 = 409.05/x
  3. Step 3: Cross multiply
    723.79x = 998.83 × 409.05
  4. Step 4: Simplify right side
    723.79x = 408,570.01
  5. Step 5: Solve for x
    x = 408,570.01/723.79
  6. Step 6: Final answer
    x = 564.49

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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.