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Finding the Fourth Proportional to 139.36, 191.82 and 113.20

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Solution

The fourth proportional to 139.36, 191.82 and 113.20 is: 155.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.36 : 191.82 = 113.20 : x
  2. Step 2: Convert to fraction form
    139.36/191.82 = 113.20/x
  3. Step 3: Cross multiply
    139.36x = 191.82 × 113.20
  4. Step 4: Simplify right side
    139.36x = 21,714.02
  5. Step 5: Solve for x
    x = 21,714.02/139.36
  6. Step 6: Final answer
    x = 155.81

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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.