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Finding the Fourth Proportional to 256.31, 353.36 and 207.11

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Solution

The fourth proportional to 256.31, 353.36 and 207.11 is: 285.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.31 : 353.36 = 207.11 : x
  2. Step 2: Convert to fraction form
    256.31/353.36 = 207.11/x
  3. Step 3: Cross multiply
    256.31x = 353.36 × 207.11
  4. Step 4: Simplify right side
    256.31x = 73,183.80
  5. Step 5: Solve for x
    x = 73,183.80/256.31
  6. Step 6: Final answer
    x = 285.52

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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.