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Finding the Fourth Proportional to 139.42, 207.99 and 137.60

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Solution

The fourth proportional to 139.42, 207.99 and 137.60 is: 205.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.42 : 207.99 = 137.60 : x
  2. Step 2: Convert to fraction form
    139.42/207.99 = 137.60/x
  3. Step 3: Cross multiply
    139.42x = 207.99 × 137.60
  4. Step 4: Simplify right side
    139.42x = 28,619.55
  5. Step 5: Solve for x
    x = 28,619.55/139.42
  6. Step 6: Final answer
    x = 205.27

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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.