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Finding the Fourth Proportional to 200.78, 300.31 and 149.04

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Solution

The fourth proportional to 200.78, 300.31 and 149.04 is: 222.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.78 : 300.31 = 149.04 : x
  2. Step 2: Convert to fraction form
    200.78/300.31 = 149.04/x
  3. Step 3: Cross multiply
    200.78x = 300.31 × 149.04
  4. Step 4: Simplify right side
    200.78x = 44,757.83
  5. Step 5: Solve for x
    x = 44,757.83/200.78
  6. Step 6: Final answer
    x = 222.92

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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.