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Finding the Fourth Proportional to 199.10, 274.79 and 129.06

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Solution

The fourth proportional to 199.10, 274.79 and 129.06 is: 178.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.10 : 274.79 = 129.06 : x
  2. Step 2: Convert to fraction form
    199.10/274.79 = 129.06/x
  3. Step 3: Cross multiply
    199.10x = 274.79 × 129.06
  4. Step 4: Simplify right side
    199.10x = 35,464.72
  5. Step 5: Solve for x
    x = 35,464.72/199.10
  6. Step 6: Final answer
    x = 178.12

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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.