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Finding the Fourth Proportional to 1,242.45, 1,863.91 and 409.56

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Solution

The fourth proportional to 1,242.45, 1,863.91 and 409.56 is: 614.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.45 : 1,863.91 = 409.56 : x
  2. Step 2: Convert to fraction form
    1,242.45/1,863.91 = 409.56/x
  3. Step 3: Cross multiply
    1,242.45x = 1,863.91 × 409.56
  4. Step 4: Simplify right side
    1,242.45x = 763,382.98
  5. Step 5: Solve for x
    x = 763,382.98/1,242.45
  6. Step 6: Final answer
    x = 614.42

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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.