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Finding the Fourth Proportional to 180.79, 249.21 and 143.19

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Solution

The fourth proportional to 180.79, 249.21 and 143.19 is: 197.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.79 : 249.21 = 143.19 : x
  2. Step 2: Convert to fraction form
    180.79/249.21 = 143.19/x
  3. Step 3: Cross multiply
    180.79x = 249.21 × 143.19
  4. Step 4: Simplify right side
    180.79x = 35,684.38
  5. Step 5: Solve for x
    x = 35,684.38/180.79
  6. Step 6: Final answer
    x = 197.38

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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.