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Finding the Fourth Proportional to 139.41, 207.63 and 137.79

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Solution

The fourth proportional to 139.41, 207.63 and 137.79 is: 205.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.41 : 207.63 = 137.79 : x
  2. Step 2: Convert to fraction form
    139.41/207.63 = 137.79/x
  3. Step 3: Cross multiply
    139.41x = 207.63 × 137.79
  4. Step 4: Simplify right side
    139.41x = 28,609.34
  5. Step 5: Solve for x
    x = 28,609.34/139.41
  6. Step 6: Final answer
    x = 205.22

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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.