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Finding the Fourth Proportional to 169.20, 253.68 and 77.79

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Solution

The fourth proportional to 169.20, 253.68 and 77.79 is: 116.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.20 : 253.68 = 77.79 : x
  2. Step 2: Convert to fraction form
    169.20/253.68 = 77.79/x
  3. Step 3: Cross multiply
    169.20x = 253.68 × 77.79
  4. Step 4: Simplify right side
    169.20x = 19,733.77
  5. Step 5: Solve for x
    x = 19,733.77/169.20
  6. Step 6: Final answer
    x = 116.63

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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.