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Finding the Fourth Proportional to 169.20, 253.72 and 100.76

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Solution

The fourth proportional to 169.20, 253.72 and 100.76 is: 151.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.20 : 253.72 = 100.76 : x
  2. Step 2: Convert to fraction form
    169.20/253.72 = 100.76/x
  3. Step 3: Cross multiply
    169.20x = 253.72 × 100.76
  4. Step 4: Simplify right side
    169.20x = 25,563.68
  5. Step 5: Solve for x
    x = 25,563.68/169.20
  6. Step 6: Final answer
    x = 151.09

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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.