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Finding the Fourth Proportional to 79.26, 110.12 and 78.56

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Solution

The fourth proportional to 79.26, 110.12 and 78.56 is: 109.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.26 : 110.12 = 78.56 : x
  2. Step 2: Convert to fraction form
    79.26/110.12 = 78.56/x
  3. Step 3: Cross multiply
    79.26x = 110.12 × 78.56
  4. Step 4: Simplify right side
    79.26x = 8,650.08
  5. Step 5: Solve for x
    x = 8,650.08/79.26
  6. Step 6: Final answer
    x = 109.14

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.