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Finding the Fourth Proportional to 109.91, 164.70 and 61.71

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Solution

The fourth proportional to 109.91, 164.70 and 61.71 is: 92.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.91 : 164.70 = 61.71 : x
  2. Step 2: Convert to fraction form
    109.91/164.70 = 61.71/x
  3. Step 3: Cross multiply
    109.91x = 164.70 × 61.71
  4. Step 4: Simplify right side
    109.91x = 10,163.64
  5. Step 5: Solve for x
    x = 10,163.64/109.91
  6. Step 6: Final answer
    x = 92.48

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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.