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Finding the Fourth Proportional to 371.86, 513.21 and 255.22

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Solution

The fourth proportional to 371.86, 513.21 and 255.22 is: 352.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.86 : 513.21 = 255.22 : x
  2. Step 2: Convert to fraction form
    371.86/513.21 = 255.22/x
  3. Step 3: Cross multiply
    371.86x = 513.21 × 255.22
  4. Step 4: Simplify right side
    371.86x = 130,981.46
  5. Step 5: Solve for x
    x = 130,981.46/371.86
  6. Step 6: Final answer
    x = 352.23

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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.