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Finding the Fourth Proportional to 139.90, 193.24 and 107.55

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Solution

The fourth proportional to 139.90, 193.24 and 107.55 is: 148.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.90 : 193.24 = 107.55 : x
  2. Step 2: Convert to fraction form
    139.90/193.24 = 107.55/x
  3. Step 3: Cross multiply
    139.90x = 193.24 × 107.55
  4. Step 4: Simplify right side
    139.90x = 20,782.69
  5. Step 5: Solve for x
    x = 20,782.69/139.90
  6. Step 6: Final answer
    x = 148.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.