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Finding the Fourth Proportional to 1,243.94, 1,866.10 and 422.26

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Solution

The fourth proportional to 1,243.94, 1,866.10 and 422.26 is: 633.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.94 : 1,866.10 = 422.26 : x
  2. Step 2: Convert to fraction form
    1,243.94/1,866.10 = 422.26/x
  3. Step 3: Cross multiply
    1,243.94x = 1,866.10 × 422.26
  4. Step 4: Simplify right side
    1,243.94x = 787,979.39
  5. Step 5: Solve for x
    x = 787,979.39/1,243.94
  6. Step 6: Final answer
    x = 633.45

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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.