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Finding the Fourth Proportional to 79.60, 109.81 and 57.73

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Solution

The fourth proportional to 79.60, 109.81 and 57.73 is: 79.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.60 : 109.81 = 57.73 : x
  2. Step 2: Convert to fraction form
    79.60/109.81 = 57.73/x
  3. Step 3: Cross multiply
    79.60x = 109.81 × 57.73
  4. Step 4: Simplify right side
    79.60x = 6,339.33
  5. Step 5: Solve for x
    x = 6,339.33/79.60
  6. Step 6: Final answer
    x = 79.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.