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Finding the Fourth Proportional to 143.12, 196.30 and 139.52

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Solution

The fourth proportional to 143.12, 196.30 and 139.52 is: 191.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.12 : 196.30 = 139.52 : x
  2. Step 2: Convert to fraction form
    143.12/196.30 = 139.52/x
  3. Step 3: Cross multiply
    143.12x = 196.30 × 139.52
  4. Step 4: Simplify right side
    143.12x = 27,387.78
  5. Step 5: Solve for x
    x = 27,387.78/143.12
  6. Step 6: Final answer
    x = 191.36

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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.