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Finding the Fourth Proportional to 371.50, 512.40 and 238.80

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Solution

The fourth proportional to 371.50, 512.40 and 238.80 is: 329.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.50 : 512.40 = 238.80 : x
  2. Step 2: Convert to fraction form
    371.50/512.40 = 238.80/x
  3. Step 3: Cross multiply
    371.50x = 512.40 × 238.80
  4. Step 4: Simplify right side
    371.50x = 122,361.12
  5. Step 5: Solve for x
    x = 122,361.12/371.50
  6. Step 6: Final answer
    x = 329.37

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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.