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Finding the Fourth Proportional to 143.22, 196.47 and 139.62

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Solution

The fourth proportional to 143.22, 196.47 and 139.62 is: 191.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.22 : 196.47 = 139.62 : x
  2. Step 2: Convert to fraction form
    143.22/196.47 = 139.62/x
  3. Step 3: Cross multiply
    143.22x = 196.47 × 139.62
  4. Step 4: Simplify right side
    143.22x = 27,431.14
  5. Step 5: Solve for x
    x = 27,431.14/143.22
  6. Step 6: Final answer
    x = 191.53

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.