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Finding the Fourth Proportional to 139.36, 208.88 and 67.12

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Solution

The fourth proportional to 139.36, 208.88 and 67.12 is: 100.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.36 : 208.88 = 67.12 : x
  2. Step 2: Convert to fraction form
    139.36/208.88 = 67.12/x
  3. Step 3: Cross multiply
    139.36x = 208.88 × 67.12
  4. Step 4: Simplify right side
    139.36x = 14,020.03
  5. Step 5: Solve for x
    x = 14,020.03/139.36
  6. Step 6: Final answer
    x = 100.60

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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.