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Finding the Fourth Proportional to 189.40, 261.37 and 105.38

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Solution

The fourth proportional to 189.40, 261.37 and 105.38 is: 145.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.40 : 261.37 = 105.38 : x
  2. Step 2: Convert to fraction form
    189.40/261.37 = 105.38/x
  3. Step 3: Cross multiply
    189.40x = 261.37 × 105.38
  4. Step 4: Simplify right side
    189.40x = 27,543.17
  5. Step 5: Solve for x
    x = 27,543.17/189.40
  6. Step 6: Final answer
    x = 145.42

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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.