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Finding the Fourth Proportional to 139.22, 191.97 and 138.00

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Solution

The fourth proportional to 139.22, 191.97 and 138.00 is: 190.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.22 : 191.97 = 138.00 : x
  2. Step 2: Convert to fraction form
    139.22/191.97 = 138.00/x
  3. Step 3: Cross multiply
    139.22x = 191.97 × 138.00
  4. Step 4: Simplify right side
    139.22x = 26,492.58
  5. Step 5: Solve for x
    x = 26,492.58/139.22
  6. Step 6: Final answer
    x = 190.29

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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.