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Finding the Fourth Proportional to 109.34, 164.04 and 76.87

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Solution

The fourth proportional to 109.34, 164.04 and 76.87 is: 115.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.34 : 164.04 = 76.87 : x
  2. Step 2: Convert to fraction form
    109.34/164.04 = 76.87/x
  3. Step 3: Cross multiply
    109.34x = 164.04 × 76.87
  4. Step 4: Simplify right side
    109.34x = 12,609.75
  5. Step 5: Solve for x
    x = 12,609.75/109.34
  6. Step 6: Final answer
    x = 115.33

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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.