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Finding the Fourth Proportional to 200.75, 301.86 and 155.21

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Solution

The fourth proportional to 200.75, 301.86 and 155.21 is: 233.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.75 : 301.86 = 155.21 : x
  2. Step 2: Convert to fraction form
    200.75/301.86 = 155.21/x
  3. Step 3: Cross multiply
    200.75x = 301.86 × 155.21
  4. Step 4: Simplify right side
    200.75x = 46,850.18
  5. Step 5: Solve for x
    x = 46,850.18/200.75
  6. Step 6: Final answer
    x = 233.38

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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.