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Finding the Fourth Proportional to 79.48, 108.89 and 78.64

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Solution

The fourth proportional to 79.48, 108.89 and 78.64 is: 107.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.48 : 108.89 = 78.64 : x
  2. Step 2: Convert to fraction form
    79.48/108.89 = 78.64/x
  3. Step 3: Cross multiply
    79.48x = 108.89 × 78.64
  4. Step 4: Simplify right side
    79.48x = 8,563.11
  5. Step 5: Solve for x
    x = 8,563.11/79.48
  6. Step 6: Final answer
    x = 107.74

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.