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Finding the Fourth Proportional to 139.19, 191.79 and 104.22

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Solution

The fourth proportional to 139.19, 191.79 and 104.22 is: 143.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.19 : 191.79 = 104.22 : x
  2. Step 2: Convert to fraction form
    139.19/191.79 = 104.22/x
  3. Step 3: Cross multiply
    139.19x = 191.79 × 104.22
  4. Step 4: Simplify right side
    139.19x = 19,988.35
  5. Step 5: Solve for x
    x = 19,988.35/139.19
  6. Step 6: Final answer
    x = 143.61

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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.