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Finding the Fourth Proportional to 109.70, 164.54 and 73.86

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Solution

The fourth proportional to 109.70, 164.54 and 73.86 is: 110.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.70 : 164.54 = 73.86 : x
  2. Step 2: Convert to fraction form
    109.70/164.54 = 73.86/x
  3. Step 3: Cross multiply
    109.70x = 164.54 × 73.86
  4. Step 4: Simplify right side
    109.70x = 12,152.92
  5. Step 5: Solve for x
    x = 12,152.92/109.70
  6. Step 6: Final answer
    x = 110.78

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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.