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Finding the Fourth Proportional to 139.47, 192.56 and 108.33

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Solution

The fourth proportional to 139.47, 192.56 and 108.33 is: 149.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.47 : 192.56 = 108.33 : x
  2. Step 2: Convert to fraction form
    139.47/192.56 = 108.33/x
  3. Step 3: Cross multiply
    139.47x = 192.56 × 108.33
  4. Step 4: Simplify right side
    139.47x = 20,860.02
  5. Step 5: Solve for x
    x = 20,860.02/139.47
  6. Step 6: Final answer
    x = 149.57

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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.