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Finding the Fourth Proportional to 168.72, 253.11 and 53.18

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Solution

The fourth proportional to 168.72, 253.11 and 53.18 is: 79.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.72 : 253.11 = 53.18 : x
  2. Step 2: Convert to fraction form
    168.72/253.11 = 53.18/x
  3. Step 3: Cross multiply
    168.72x = 253.11 × 53.18
  4. Step 4: Simplify right side
    168.72x = 13,459.97
  5. Step 5: Solve for x
    x = 13,459.97/168.72
  6. Step 6: Final answer
    x = 79.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.