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Finding the Fourth Proportional to 201.80, 301.15 and 155.90

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Solution

The fourth proportional to 201.80, 301.15 and 155.90 is: 232.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.80 : 301.15 = 155.90 : x
  2. Step 2: Convert to fraction form
    201.80/301.15 = 155.90/x
  3. Step 3: Cross multiply
    201.80x = 301.15 × 155.90
  4. Step 4: Simplify right side
    201.80x = 46,949.29
  5. Step 5: Solve for x
    x = 46,949.29/201.80
  6. Step 6: Final answer
    x = 232.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.