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Finding the Fourth Proportional to 371.72, 513.02 and 278.31

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Solution

The fourth proportional to 371.72, 513.02 and 278.31 is: 384.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.72 : 513.02 = 278.31 : x
  2. Step 2: Convert to fraction form
    371.72/513.02 = 278.31/x
  3. Step 3: Cross multiply
    371.72x = 513.02 × 278.31
  4. Step 4: Simplify right side
    371.72x = 142,777.20
  5. Step 5: Solve for x
    x = 142,777.20/371.72
  6. Step 6: Final answer
    x = 384.10

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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.