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Finding the Fourth Proportional to 199.19, 274.68 and 129.17

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Solution

The fourth proportional to 199.19, 274.68 and 129.17 is: 178.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.19 : 274.68 = 129.17 : x
  2. Step 2: Convert to fraction form
    199.19/274.68 = 129.17/x
  3. Step 3: Cross multiply
    199.19x = 274.68 × 129.17
  4. Step 4: Simplify right side
    199.19x = 35,479.04
  5. Step 5: Solve for x
    x = 35,479.04/199.19
  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.