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Finding the Fourth Proportional to 200.82, 300.87 and 139.83

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Solution

The fourth proportional to 200.82, 300.87 and 139.83 is: 209.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.82 : 300.87 = 139.83 : x
  2. Step 2: Convert to fraction form
    200.82/300.87 = 139.83/x
  3. Step 3: Cross multiply
    200.82x = 300.87 × 139.83
  4. Step 4: Simplify right side
    200.82x = 42,070.65
  5. Step 5: Solve for x
    x = 42,070.65/200.82
  6. Step 6: Final answer
    x = 209.50

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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.