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Finding the Fourth Proportional to 79.32, 110.22 and 78.30

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Solution

The fourth proportional to 79.32, 110.22 and 78.30 is: 108.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.32 : 110.22 = 78.30 : x
  2. Step 2: Convert to fraction form
    79.32/110.22 = 78.30/x
  3. Step 3: Cross multiply
    79.32x = 110.22 × 78.30
  4. Step 4: Simplify right side
    79.32x = 8,630.23
  5. Step 5: Solve for x
    x = 8,630.23/79.32
  6. Step 6: Final answer
    x = 108.80

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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.