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Finding the Fourth Proportional to 169.20, 253.60 and 87.92

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Solution

The fourth proportional to 169.20, 253.60 and 87.92 is: 131.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.20 : 253.60 = 87.92 : x
  2. Step 2: Convert to fraction form
    169.20/253.60 = 87.92/x
  3. Step 3: Cross multiply
    169.20x = 253.60 × 87.92
  4. Step 4: Simplify right side
    169.20x = 22,296.51
  5. Step 5: Solve for x
    x = 22,296.51/169.20
  6. Step 6: Final answer
    x = 131.78

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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.