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Finding the Fourth Proportional to 199.16, 298.40 and 138.08

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Solution

The fourth proportional to 199.16, 298.40 and 138.08 is: 206.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.16 : 298.40 = 138.08 : x
  2. Step 2: Convert to fraction form
    199.16/298.40 = 138.08/x
  3. Step 3: Cross multiply
    199.16x = 298.40 × 138.08
  4. Step 4: Simplify right side
    199.16x = 41,203.07
  5. Step 5: Solve for x
    x = 41,203.07/199.16
  6. Step 6: Final answer
    x = 206.88

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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.