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Finding the Fourth Proportional to 199.69, 299.53 and 91.47

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Solution

The fourth proportional to 199.69, 299.53 and 91.47 is: 137.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.69 : 299.53 = 91.47 : x
  2. Step 2: Convert to fraction form
    199.69/299.53 = 91.47/x
  3. Step 3: Cross multiply
    199.69x = 299.53 × 91.47
  4. Step 4: Simplify right side
    199.69x = 27,399.25
  5. Step 5: Solve for x
    x = 27,399.25/199.69
  6. Step 6: Final answer
    x = 137.21

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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.