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Finding the Fourth Proportional to 199.83, 299.79 and 138.99

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Solution

The fourth proportional to 199.83, 299.79 and 138.99 is: 208.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.83 : 299.79 = 138.99 : x
  2. Step 2: Convert to fraction form
    199.83/299.79 = 138.99/x
  3. Step 3: Cross multiply
    199.83x = 299.79 × 138.99
  4. Step 4: Simplify right side
    199.83x = 41,667.81
  5. Step 5: Solve for x
    x = 41,667.81/199.83
  6. Step 6: Final answer
    x = 208.52

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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.