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Finding the Fourth Proportional to 372.20, 513.75 and 261.71

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Solution

The fourth proportional to 372.20, 513.75 and 261.71 is: 361.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.20 : 513.75 = 261.71 : x
  2. Step 2: Convert to fraction form
    372.20/513.75 = 261.71/x
  3. Step 3: Cross multiply
    372.20x = 513.75 × 261.71
  4. Step 4: Simplify right side
    372.20x = 134,453.51
  5. Step 5: Solve for x
    x = 134,453.51/372.20
  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.