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Finding the Fourth Proportional to 402.31, 555.20 and 271.09

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Solution

The fourth proportional to 402.31, 555.20 and 271.09 is: 374.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.31 : 555.20 = 271.09 : x
  2. Step 2: Convert to fraction form
    402.31/555.20 = 271.09/x
  3. Step 3: Cross multiply
    402.31x = 555.20 × 271.09
  4. Step 4: Simplify right side
    402.31x = 150,507.81
  5. Step 5: Solve for x
    x = 150,507.81/402.31
  6. Step 6: Final answer
    x = 374.11

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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.