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Finding the Fourth Proportional to 189.89, 261.89 and 143.27

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Solution

The fourth proportional to 189.89, 261.89 and 143.27 is: 197.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.89 : 261.89 = 143.27 : x
  2. Step 2: Convert to fraction form
    189.89/261.89 = 143.27/x
  3. Step 3: Cross multiply
    189.89x = 261.89 × 143.27
  4. Step 4: Simplify right side
    189.89x = 37,519.67
  5. Step 5: Solve for x
    x = 37,519.67/189.89
  6. Step 6: Final answer
    x = 197.59

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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.