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Finding the Fourth Proportional to 199.68, 274.90 and 189.42

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Solution

The fourth proportional to 199.68, 274.90 and 189.42 is: 260.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.68 : 274.90 = 189.42 : x
  2. Step 2: Convert to fraction form
    199.68/274.90 = 189.42/x
  3. Step 3: Cross multiply
    199.68x = 274.90 × 189.42
  4. Step 4: Simplify right side
    199.68x = 52,071.56
  5. Step 5: Solve for x
    x = 52,071.56/199.68
  6. Step 6: Final answer
    x = 260.78

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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.