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Finding the Fourth Proportional to 200.72, 300.90 and 104.42

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Solution

The fourth proportional to 200.72, 300.90 and 104.42 is: 156.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.72 : 300.90 = 104.42 : x
  2. Step 2: Convert to fraction form
    200.72/300.90 = 104.42/x
  3. Step 3: Cross multiply
    200.72x = 300.90 × 104.42
  4. Step 4: Simplify right side
    200.72x = 31,419.98
  5. Step 5: Solve for x
    x = 31,419.98/200.72
  6. Step 6: Final answer
    x = 156.54

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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.