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Finding the Fourth Proportional to 139.93, 208.45 and 137.64

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Solution

The fourth proportional to 139.93, 208.45 and 137.64 is: 205.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.93 : 208.45 = 137.64 : x
  2. Step 2: Convert to fraction form
    139.93/208.45 = 137.64/x
  3. Step 3: Cross multiply
    139.93x = 208.45 × 137.64
  4. Step 4: Simplify right side
    139.93x = 28,691.06
  5. Step 5: Solve for x
    x = 28,691.06/139.93
  6. Step 6: Final answer
    x = 205.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.