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Finding the Fourth Proportional to 109.56, 164.28 and 79.20

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Solution

The fourth proportional to 109.56, 164.28 and 79.20 is: 118.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.56 : 164.28 = 79.20 : x
  2. Step 2: Convert to fraction form
    109.56/164.28 = 79.20/x
  3. Step 3: Cross multiply
    109.56x = 164.28 × 79.20
  4. Step 4: Simplify right side
    109.56x = 13,010.98
  5. Step 5: Solve for x
    x = 13,010.98/109.56
  6. Step 6: Final answer
    x = 118.76

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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.