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Finding the Fourth Proportional to 139.03, 190.69 and 122.63

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Solution

The fourth proportional to 139.03, 190.69 and 122.63 is: 168.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.03 : 190.69 = 122.63 : x
  2. Step 2: Convert to fraction form
    139.03/190.69 = 122.63/x
  3. Step 3: Cross multiply
    139.03x = 190.69 × 122.63
  4. Step 4: Simplify right side
    139.03x = 23,384.31
  5. Step 5: Solve for x
    x = 23,384.31/139.03
  6. Step 6: Final answer
    x = 168.20

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.