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Finding the Fourth Proportional to 353.28, 487.51 and 205.91

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Solution

The fourth proportional to 353.28, 487.51 and 205.91 is: 284.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.28 : 487.51 = 205.91 : x
  2. Step 2: Convert to fraction form
    353.28/487.51 = 205.91/x
  3. Step 3: Cross multiply
    353.28x = 487.51 × 205.91
  4. Step 4: Simplify right side
    353.28x = 100,383.18
  5. Step 5: Solve for x
    x = 100,383.18/353.28
  6. Step 6: Final answer
    x = 284.15

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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.