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Finding the Fourth Proportional to 723.81, 998.80 and 409.13

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Solution

The fourth proportional to 723.81, 998.80 and 409.13 is: 564.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.81 : 998.80 = 409.13 : x
  2. Step 2: Convert to fraction form
    723.81/998.80 = 409.13/x
  3. Step 3: Cross multiply
    723.81x = 998.80 × 409.13
  4. Step 4: Simplify right side
    723.81x = 408,639.04
  5. Step 5: Solve for x
    x = 408,639.04/723.81
  6. Step 6: Final answer
    x = 564.57

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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.