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Finding the Fourth Proportional to 189.40, 261.31 and 131.21

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Solution

The fourth proportional to 189.40, 261.31 and 131.21 is: 181.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.40 : 261.31 = 131.21 : x
  2. Step 2: Convert to fraction form
    189.40/261.31 = 131.21/x
  3. Step 3: Cross multiply
    189.40x = 261.31 × 131.21
  4. Step 4: Simplify right side
    189.40x = 34,286.81
  5. Step 5: Solve for x
    x = 34,286.81/189.40
  6. Step 6: Final answer
    x = 181.03

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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.