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Finding the Fourth Proportional to 199.07, 274.65 and 129.18

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Solution

The fourth proportional to 199.07, 274.65 and 129.18 is: 178.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.07 : 274.65 = 129.18 : x
  2. Step 2: Convert to fraction form
    199.07/274.65 = 129.18/x
  3. Step 3: Cross multiply
    199.07x = 274.65 × 129.18
  4. Step 4: Simplify right side
    199.07x = 35,479.29
  5. Step 5: Solve for x
    x = 35,479.29/199.07
  6. Step 6: Final answer
    x = 178.23

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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.