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Finding the Fourth Proportional to 199.10, 274.92 and 129.20

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Solution

The fourth proportional to 199.10, 274.92 and 129.20 is: 178.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.10 : 274.92 = 129.20 : x
  2. Step 2: Convert to fraction form
    199.10/274.92 = 129.20/x
  3. Step 3: Cross multiply
    199.10x = 274.92 × 129.20
  4. Step 4: Simplify right side
    199.10x = 35,519.66
  5. Step 5: Solve for x
    x = 35,519.66/199.10
  6. Step 6: Final answer
    x = 178.40

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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.