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Finding the Fourth Proportional to 199.50, 299.13 and 91.23

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Solution

The fourth proportional to 199.50, 299.13 and 91.23 is: 136.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.50 : 299.13 = 91.23 : x
  2. Step 2: Convert to fraction form
    199.50/299.13 = 91.23/x
  3. Step 3: Cross multiply
    199.50x = 299.13 × 91.23
  4. Step 4: Simplify right side
    199.50x = 27,288.13
  5. Step 5: Solve for x
    x = 27,288.13/199.50
  6. Step 6: Final answer
    x = 136.79

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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.