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Finding the Fourth Proportional to 291.21, 400.92 and 252.39

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Solution

The fourth proportional to 291.21, 400.92 and 252.39 is: 347.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.21 : 400.92 = 252.39 : x
  2. Step 2: Convert to fraction form
    291.21/400.92 = 252.39/x
  3. Step 3: Cross multiply
    291.21x = 400.92 × 252.39
  4. Step 4: Simplify right side
    291.21x = 101,188.20
  5. Step 5: Solve for x
    x = 101,188.20/291.21
  6. Step 6: Final answer
    x = 347.48

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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.