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Finding the Fourth Proportional to 199.47, 299.31 and 91.23

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Solution

The fourth proportional to 199.47, 299.31 and 91.23 is: 136.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.47 : 299.31 = 91.23 : x
  2. Step 2: Convert to fraction form
    199.47/299.31 = 91.23/x
  3. Step 3: Cross multiply
    199.47x = 299.31 × 91.23
  4. Step 4: Simplify right side
    199.47x = 27,306.05
  5. Step 5: Solve for x
    x = 27,306.05/199.47
  6. Step 6: Final answer
    x = 136.89

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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.