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Finding the Fourth Proportional to 139.35, 192.31 and 84.08

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Solution

The fourth proportional to 139.35, 192.31 and 84.08 is: 116.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.35 : 192.31 = 84.08 : x
  2. Step 2: Convert to fraction form
    139.35/192.31 = 84.08/x
  3. Step 3: Cross multiply
    139.35x = 192.31 × 84.08
  4. Step 4: Simplify right side
    139.35x = 16,168.52
  5. Step 5: Solve for x
    x = 16,168.52/139.35
  6. Step 6: Final answer
    x = 116.03

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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.