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Finding the Fourth Proportional to 139.62, 191.61 and 137.22

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Solution

The fourth proportional to 139.62, 191.61 and 137.22 is: 188.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.62 : 191.61 = 137.22 : x
  2. Step 2: Convert to fraction form
    139.62/191.61 = 137.22/x
  3. Step 3: Cross multiply
    139.62x = 191.61 × 137.22
  4. Step 4: Simplify right side
    139.62x = 26,292.72
  5. Step 5: Solve for x
    x = 26,292.72/139.62
  6. Step 6: Final answer
    x = 188.32

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.