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Finding the Fourth Proportional to 143.11, 197.44 and 115.51

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Solution

The fourth proportional to 143.11, 197.44 and 115.51 is: 159.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.11 : 197.44 = 115.51 : x
  2. Step 2: Convert to fraction form
    143.11/197.44 = 115.51/x
  3. Step 3: Cross multiply
    143.11x = 197.44 × 115.51
  4. Step 4: Simplify right side
    143.11x = 22,806.29
  5. Step 5: Solve for x
    x = 22,806.29/143.11
  6. Step 6: Final answer
    x = 159.36

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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.