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Finding the Fourth Proportional to 139.53, 192.80 and 108.53

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Solution

The fourth proportional to 139.53, 192.80 and 108.53 is: 149.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.53 : 192.80 = 108.53 : x
  2. Step 2: Convert to fraction form
    139.53/192.80 = 108.53/x
  3. Step 3: Cross multiply
    139.53x = 192.80 × 108.53
  4. Step 4: Simplify right side
    139.53x = 20,923.89
  5. Step 5: Solve for x
    x = 20,923.89/139.53
  6. Step 6: Final answer
    x = 149.96

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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.