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Finding the Fourth Proportional to 199.13, 274.71 and 129.21

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Solution

The fourth proportional to 199.13, 274.71 and 129.21 is: 178.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.13 : 274.71 = 129.21 : x
  2. Step 2: Convert to fraction form
    199.13/274.71 = 129.21/x
  3. Step 3: Cross multiply
    199.13x = 274.71 × 129.21
  4. Step 4: Simplify right side
    199.13x = 35,494.79
  5. Step 5: Solve for x
    x = 35,494.79/199.13
  6. Step 6: Final answer
    x = 178.25

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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.