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Finding the Fourth Proportional to 291.10, 401.42 and 249.80

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Solution

The fourth proportional to 291.10, 401.42 and 249.80 is: 344.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.10 : 401.42 = 249.80 : x
  2. Step 2: Convert to fraction form
    291.10/401.42 = 249.80/x
  3. Step 3: Cross multiply
    291.10x = 401.42 × 249.80
  4. Step 4: Simplify right side
    291.10x = 100,274.72
  5. Step 5: Solve for x
    x = 100,274.72/291.10
  6. Step 6: Final answer
    x = 344.47

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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.