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Finding the Fourth Proportional to 1,244.67, 1,866.54 and 422.72

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Solution

The fourth proportional to 1,244.67, 1,866.54 and 422.72 is: 633.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,244.67 : 1,866.54 = 422.72 : x
  2. Step 2: Convert to fraction form
    1,244.67/1,866.54 = 422.72/x
  3. Step 3: Cross multiply
    1,244.67x = 1,866.54 × 422.72
  4. Step 4: Simplify right side
    1,244.67x = 789,023.04
  5. Step 5: Solve for x
    x = 789,023.04/1,244.67
  6. Step 6: Final answer
    x = 633.92

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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.