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Finding the Fourth Proportional to 208.05, 286.94 and 137.99

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Solution

The fourth proportional to 208.05, 286.94 and 137.99 is: 190.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.05 : 286.94 = 137.99 : x
  2. Step 2: Convert to fraction form
    208.05/286.94 = 137.99/x
  3. Step 3: Cross multiply
    208.05x = 286.94 × 137.99
  4. Step 4: Simplify right side
    208.05x = 39,595.91
  5. Step 5: Solve for x
    x = 39,595.91/208.05
  6. Step 6: Final answer
    x = 190.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.