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Finding the Fourth Proportional to 200.72, 300.96 and 103.21

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Solution

The fourth proportional to 200.72, 300.96 and 103.21 is: 154.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.72 : 300.96 = 103.21 : x
  2. Step 2: Convert to fraction form
    200.72/300.96 = 103.21/x
  3. Step 3: Cross multiply
    200.72x = 300.96 × 103.21
  4. Step 4: Simplify right side
    200.72x = 31,062.08
  5. Step 5: Solve for x
    x = 31,062.08/200.72
  6. Step 6: Final answer
    x = 154.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.