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Finding the Fourth Proportional to 168.12, 253.36 and 139.88

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Solution

The fourth proportional to 168.12, 253.36 and 139.88 is: 210.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.12 : 253.36 = 139.88 : x
  2. Step 2: Convert to fraction form
    168.12/253.36 = 139.88/x
  3. Step 3: Cross multiply
    168.12x = 253.36 × 139.88
  4. Step 4: Simplify right side
    168.12x = 35,440.00
  5. Step 5: Solve for x
    x = 35,440.00/168.12
  6. Step 6: Final answer
    x = 210.80

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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.