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Finding the Fourth Proportional to 169.06, 253.62 and 77.76

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Solution

The fourth proportional to 169.06, 253.62 and 77.76 is: 116.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.06 : 253.62 = 77.76 : x
  2. Step 2: Convert to fraction form
    169.06/253.62 = 77.76/x
  3. Step 3: Cross multiply
    169.06x = 253.62 × 77.76
  4. Step 4: Simplify right side
    169.06x = 19,720.83
  5. Step 5: Solve for x
    x = 19,720.83/169.06
  6. Step 6: Final answer
    x = 116.65

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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.