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Finding the Fourth Proportional to 139.43, 208.97 and 105.08

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Solution

The fourth proportional to 139.43, 208.97 and 105.08 is: 157.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.43 : 208.97 = 105.08 : x
  2. Step 2: Convert to fraction form
    139.43/208.97 = 105.08/x
  3. Step 3: Cross multiply
    139.43x = 208.97 × 105.08
  4. Step 4: Simplify right side
    139.43x = 21,957.98
  5. Step 5: Solve for x
    x = 21,957.98/139.43
  6. Step 6: Final answer
    x = 157.49

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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.