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Finding the Fourth Proportional to 189.87, 262.23 and 143.16

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Solution

The fourth proportional to 189.87, 262.23 and 143.16 is: 197.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.87 : 262.23 = 143.16 : x
  2. Step 2: Convert to fraction form
    189.87/262.23 = 143.16/x
  3. Step 3: Cross multiply
    189.87x = 262.23 × 143.16
  4. Step 4: Simplify right side
    189.87x = 37,540.85
  5. Step 5: Solve for x
    x = 37,540.85/189.87
  6. Step 6: Final answer
    x = 197.72

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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.