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Finding the Fourth Proportional to 139.46, 192.47 and 98.12

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Solution

The fourth proportional to 139.46, 192.47 and 98.12 is: 135.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.46 : 192.47 = 98.12 : x
  2. Step 2: Convert to fraction form
    139.46/192.47 = 98.12/x
  3. Step 3: Cross multiply
    139.46x = 192.47 × 98.12
  4. Step 4: Simplify right side
    139.46x = 18,884.69
  5. Step 5: Solve for x
    x = 18,884.69/139.46
  6. Step 6: Final answer
    x = 135.41

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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.