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Finding the Fourth Proportional to 112.91, 169.09 and 64.67

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Solution

The fourth proportional to 112.91, 169.09 and 64.67 is: 96.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.91 : 169.09 = 64.67 : x
  2. Step 2: Convert to fraction form
    112.91/169.09 = 64.67/x
  3. Step 3: Cross multiply
    112.91x = 169.09 × 64.67
  4. Step 4: Simplify right side
    112.91x = 10,933.88
  5. Step 5: Solve for x
    x = 10,933.88/112.91
  6. Step 6: Final answer
    x = 96.84

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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.