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Finding the Fourth Proportional to 371.21, 512.72 and 278.37

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Solution

The fourth proportional to 371.21, 512.72 and 278.37 is: 384.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.21 : 512.72 = 278.37 : x
  2. Step 2: Convert to fraction form
    371.21/512.72 = 278.37/x
  3. Step 3: Cross multiply
    371.21x = 512.72 × 278.37
  4. Step 4: Simplify right side
    371.21x = 142,721.91
  5. Step 5: Solve for x
    x = 142,721.91/371.21
  6. Step 6: Final answer
    x = 384.48

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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.