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Finding the Fourth Proportional to 143.31, 197.17 and 139.29

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Solution

The fourth proportional to 143.31, 197.17 and 139.29 is: 191.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.31 : 197.17 = 139.29 : x
  2. Step 2: Convert to fraction form
    143.31/197.17 = 139.29/x
  3. Step 3: Cross multiply
    143.31x = 197.17 × 139.29
  4. Step 4: Simplify right side
    143.31x = 27,464.66
  5. Step 5: Solve for x
    x = 27,464.66/143.31
  6. Step 6: Final answer
    x = 191.65

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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.