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Finding the Fourth Proportional to 139.02, 208.64 and 131.89

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Solution

The fourth proportional to 139.02, 208.64 and 131.89 is: 197.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.02 : 208.64 = 131.89 : x
  2. Step 2: Convert to fraction form
    139.02/208.64 = 131.89/x
  3. Step 3: Cross multiply
    139.02x = 208.64 × 131.89
  4. Step 4: Simplify right side
    139.02x = 27,517.08
  5. Step 5: Solve for x
    x = 27,517.08/139.02
  6. Step 6: Final answer
    x = 197.93

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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.