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Finding the Fourth Proportional to 139.26, 192.06 and 97.80

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Solution

The fourth proportional to 139.26, 192.06 and 97.80 is: 134.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.26 : 192.06 = 97.80 : x
  2. Step 2: Convert to fraction form
    139.26/192.06 = 97.80/x
  3. Step 3: Cross multiply
    139.26x = 192.06 × 97.80
  4. Step 4: Simplify right side
    139.26x = 18,783.47
  5. Step 5: Solve for x
    x = 18,783.47/139.26
  6. Step 6: Final answer
    x = 134.88

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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.