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Finding the Fourth Proportional to 200.73, 300.65 and 139.91

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Solution

The fourth proportional to 200.73, 300.65 and 139.91 is: 209.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.73 : 300.65 = 139.91 : x
  2. Step 2: Convert to fraction form
    200.73/300.65 = 139.91/x
  3. Step 3: Cross multiply
    200.73x = 300.65 × 139.91
  4. Step 4: Simplify right side
    200.73x = 42,063.43
  5. Step 5: Solve for x
    x = 42,063.43/200.73
  6. Step 6: Final answer
    x = 209.55

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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.