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Finding the Fourth Proportional to 201.12, 301.80 and 140.28

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Solution

The fourth proportional to 201.12, 301.80 and 140.28 is: 210.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.12 : 301.80 = 140.28 : x
  2. Step 2: Convert to fraction form
    201.12/301.80 = 140.28/x
  3. Step 3: Cross multiply
    201.12x = 301.80 × 140.28
  4. Step 4: Simplify right side
    201.12x = 42,336.50
  5. Step 5: Solve for x
    x = 42,336.50/201.12
  6. Step 6: Final answer
    x = 210.50

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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.