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Finding the Fourth Proportional to 200.94, 300.90 and 140.20

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Solution

The fourth proportional to 200.94, 300.90 and 140.20 is: 209.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.94 : 300.90 = 140.20 : x
  2. Step 2: Convert to fraction form
    200.94/300.90 = 140.20/x
  3. Step 3: Cross multiply
    200.94x = 300.90 × 140.20
  4. Step 4: Simplify right side
    200.94x = 42,186.18
  5. Step 5: Solve for x
    x = 42,186.18/200.94
  6. Step 6: Final answer
    x = 209.94

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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.