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Finding the Fourth Proportional to 371.71, 512.98 and 261.21

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Solution

The fourth proportional to 371.71, 512.98 and 261.21 is: 360.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.71 : 512.98 = 261.21 : x
  2. Step 2: Convert to fraction form
    371.71/512.98 = 261.21/x
  3. Step 3: Cross multiply
    371.71x = 512.98 × 261.21
  4. Step 4: Simplify right side
    371.71x = 133,995.51
  5. Step 5: Solve for x
    x = 133,995.51/371.71
  6. Step 6: Final answer
    x = 360.48

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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.