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Finding the Fourth Proportional to 200.76, 300.85 and 139.75

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Solution

The fourth proportional to 200.76, 300.85 and 139.75 is: 209.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    200.76 : 300.85 = 139.75 : x
  2. Step 2: Convert to fraction form
    200.76/300.85 = 139.75/x
  3. Step 3: Cross multiply
    200.76x = 300.85 × 139.75
  4. Step 4: Simplify right side
    200.76x = 42,043.79
  5. Step 5: Solve for x
    x = 42,043.79/200.76
  6. Step 6: Final answer
    x = 209.42

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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.