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Finding the Fourth Proportional to 169.11, 253.58 and 86.76

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Solution

The fourth proportional to 169.11, 253.58 and 86.76 is: 130.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.11 : 253.58 = 86.76 : x
  2. Step 2: Convert to fraction form
    169.11/253.58 = 86.76/x
  3. Step 3: Cross multiply
    169.11x = 253.58 × 86.76
  4. Step 4: Simplify right side
    169.11x = 21,998.90
  5. Step 5: Solve for x
    x = 21,998.90/169.11
  6. Step 6: Final answer
    x = 130.09

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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.