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Finding the Fourth Proportional to 199.40, 299.09 and 127.71

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Solution

The fourth proportional to 199.40, 299.09 and 127.71 is: 191.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.40 : 299.09 = 127.71 : x
  2. Step 2: Convert to fraction form
    199.40/299.09 = 127.71/x
  3. Step 3: Cross multiply
    199.40x = 299.09 × 127.71
  4. Step 4: Simplify right side
    199.40x = 38,197.10
  5. Step 5: Solve for x
    x = 38,197.10/199.40
  6. Step 6: Final answer
    x = 191.57

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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.