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Finding the Fourth Proportional to 200.19, 300.18 and 81.43

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Solution

The fourth proportional to 200.19, 300.18 and 81.43 is: 122.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.19 : 300.18 = 81.43 : x
  2. Step 2: Convert to fraction form
    200.19/300.18 = 81.43/x
  3. Step 3: Cross multiply
    200.19x = 300.18 × 81.43
  4. Step 4: Simplify right side
    200.19x = 24,443.66
  5. Step 5: Solve for x
    x = 24,443.66/200.19
  6. Step 6: Final answer
    x = 122.10

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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.