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Finding the Fourth Proportional to 168.72, 253.52 and 91.74

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Solution

The fourth proportional to 168.72, 253.52 and 91.74 is: 137.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.72 : 253.52 = 91.74 : x
  2. Step 2: Convert to fraction form
    168.72/253.52 = 91.74/x
  3. Step 3: Cross multiply
    168.72x = 253.52 × 91.74
  4. Step 4: Simplify right side
    168.72x = 23,256.89
  5. Step 5: Solve for x
    x = 23,256.89/168.72
  6. Step 6: Final answer
    x = 137.85

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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.