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Finding the Fourth Proportional to 168.12, 251.19 and 139.32

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Solution

The fourth proportional to 168.12, 251.19 and 139.32 is: 208.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.12 : 251.19 = 139.32 : x
  2. Step 2: Convert to fraction form
    168.12/251.19 = 139.32/x
  3. Step 3: Cross multiply
    168.12x = 251.19 × 139.32
  4. Step 4: Simplify right side
    168.12x = 34,995.79
  5. Step 5: Solve for x
    x = 34,995.79/168.12
  6. Step 6: Final answer
    x = 208.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.