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Finding the Fourth Proportional to 109.76, 164.70 and 91.94

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Solution

The fourth proportional to 109.76, 164.70 and 91.94 is: 137.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.76 : 164.70 = 91.94 : x
  2. Step 2: Convert to fraction form
    109.76/164.70 = 91.94/x
  3. Step 3: Cross multiply
    109.76x = 164.70 × 91.94
  4. Step 4: Simplify right side
    109.76x = 15,141.69
  5. Step 5: Solve for x
    x = 15,141.69/109.76
  6. Step 6: Final answer
    x = 137.96

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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.