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Finding the Fourth Proportional to 139.38, 207.93 and 127.72

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Solution

The fourth proportional to 139.38, 207.93 and 127.72 is: 190.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.38 : 207.93 = 127.72 : x
  2. Step 2: Convert to fraction form
    139.38/207.93 = 127.72/x
  3. Step 3: Cross multiply
    139.38x = 207.93 × 127.72
  4. Step 4: Simplify right side
    139.38x = 26,556.82
  5. Step 5: Solve for x
    x = 26,556.82/139.38
  6. Step 6: Final answer
    x = 190.54

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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.