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Finding the Fourth Proportional to 139.26, 192.18 and 83.98

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Solution

The fourth proportional to 139.26, 192.18 and 83.98 is: 115.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.26 : 192.18 = 83.98 : x
  2. Step 2: Convert to fraction form
    139.26/192.18 = 83.98/x
  3. Step 3: Cross multiply
    139.26x = 192.18 × 83.98
  4. Step 4: Simplify right side
    139.26x = 16,139.28
  5. Step 5: Solve for x
    x = 16,139.28/139.26
  6. Step 6: Final answer
    x = 115.89

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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.