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Finding the Fourth Proportional to 372.21, 513.81 and 261.69

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Solution

The fourth proportional to 372.21, 513.81 and 261.69 is: 361.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.21 : 513.81 = 261.69 : x
  2. Step 2: Convert to fraction form
    372.21/513.81 = 261.69/x
  3. Step 3: Cross multiply
    372.21x = 513.81 × 261.69
  4. Step 4: Simplify right side
    372.21x = 134,458.94
  5. Step 5: Solve for x
    x = 134,458.94/372.21
  6. Step 6: Final answer
    x = 361.24

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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.