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Finding the Fourth Proportional to 199.89, 275.81 and 126.23

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Solution

The fourth proportional to 199.89, 275.81 and 126.23 is: 174.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.89 : 275.81 = 126.23 : x
  2. Step 2: Convert to fraction form
    199.89/275.81 = 126.23/x
  3. Step 3: Cross multiply
    199.89x = 275.81 × 126.23
  4. Step 4: Simplify right side
    199.89x = 34,813.49
  5. Step 5: Solve for x
    x = 34,813.49/199.89
  6. Step 6: Final answer
    x = 174.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.