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Finding the Fourth Proportional to 139.90, 192.97 and 84.55

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Solution

The fourth proportional to 139.90, 192.97 and 84.55 is: 116.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.90 : 192.97 = 84.55 : x
  2. Step 2: Convert to fraction form
    139.90/192.97 = 84.55/x
  3. Step 3: Cross multiply
    139.90x = 192.97 × 84.55
  4. Step 4: Simplify right side
    139.90x = 16,314.65
  5. Step 5: Solve for x
    x = 16,314.65/139.90
  6. Step 6: Final answer
    x = 116.61

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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.