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Finding the Fourth Proportional to 199.18, 274.86 and 111.86

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Solution

The fourth proportional to 199.18, 274.86 and 111.86 is: 154.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.18 : 274.86 = 111.86 : x
  2. Step 2: Convert to fraction form
    199.18/274.86 = 111.86/x
  3. Step 3: Cross multiply
    199.18x = 274.86 × 111.86
  4. Step 4: Simplify right side
    199.18x = 30,744.47
  5. Step 5: Solve for x
    x = 30,744.47/199.18
  6. Step 6: Final answer
    x = 154.36

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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.