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Finding the Fourth Proportional to 168.58, 253.86 and 139.96

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Solution

The fourth proportional to 168.58, 253.86 and 139.96 is: 210.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.58 : 253.86 = 139.96 : x
  2. Step 2: Convert to fraction form
    168.58/253.86 = 139.96/x
  3. Step 3: Cross multiply
    168.58x = 253.86 × 139.96
  4. Step 4: Simplify right side
    168.58x = 35,530.25
  5. Step 5: Solve for x
    x = 35,530.25/168.58
  6. Step 6: Final answer
    x = 210.76

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.