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Finding the Fourth Proportional to 189.72, 261.70 and 119.72

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Solution

The fourth proportional to 189.72, 261.70 and 119.72 is: 165.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.72 : 261.70 = 119.72 : x
  2. Step 2: Convert to fraction form
    189.72/261.70 = 119.72/x
  3. Step 3: Cross multiply
    189.72x = 261.70 × 119.72
  4. Step 4: Simplify right side
    189.72x = 31,330.72
  5. Step 5: Solve for x
    x = 31,330.72/189.72
  6. Step 6: Final answer
    x = 165.14

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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.