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Finding the Fourth Proportional to 139.05, 208.26 and 112.91

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Solution

The fourth proportional to 139.05, 208.26 and 112.91 is: 169.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.05 : 208.26 = 112.91 : x
  2. Step 2: Convert to fraction form
    139.05/208.26 = 112.91/x
  3. Step 3: Cross multiply
    139.05x = 208.26 × 112.91
  4. Step 4: Simplify right side
    139.05x = 23,513.60
  5. Step 5: Solve for x
    x = 23,513.60/139.05
  6. Step 6: Final answer
    x = 169.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.