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Finding the Fourth Proportional to 139.50, 192.24 and 106.56

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Solution

The fourth proportional to 139.50, 192.24 and 106.56 is: 146.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.50 : 192.24 = 106.56 : x
  2. Step 2: Convert to fraction form
    139.50/192.24 = 106.56/x
  3. Step 3: Cross multiply
    139.50x = 192.24 × 106.56
  4. Step 4: Simplify right side
    139.50x = 20,485.09
  5. Step 5: Solve for x
    x = 20,485.09/139.50
  6. Step 6: Final answer
    x = 146.85

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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.