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Finding the Fourth Proportional to 199.43, 275.15 and 129.47

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Solution

The fourth proportional to 199.43, 275.15 and 129.47 is: 178.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.43 : 275.15 = 129.47 : x
  2. Step 2: Convert to fraction form
    199.43/275.15 = 129.47/x
  3. Step 3: Cross multiply
    199.43x = 275.15 × 129.47
  4. Step 4: Simplify right side
    199.43x = 35,622.62
  5. Step 5: Solve for x
    x = 35,622.62/199.43
  6. Step 6: Final answer
    x = 178.62

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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.