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Finding the Fourth Proportional to 139.09, 191.47 and 120.56

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Solution

The fourth proportional to 139.09, 191.47 and 120.56 is: 165.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.09 : 191.47 = 120.56 : x
  2. Step 2: Convert to fraction form
    139.09/191.47 = 120.56/x
  3. Step 3: Cross multiply
    139.09x = 191.47 × 120.56
  4. Step 4: Simplify right side
    139.09x = 23,083.02
  5. Step 5: Solve for x
    x = 23,083.02/139.09
  6. Step 6: Final answer
    x = 165.96

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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.