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Finding the Fourth Proportional to 79.41, 109.56 and 51.81

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Solution

The fourth proportional to 79.41, 109.56 and 51.81 is: 71.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.41 : 109.56 = 51.81 : x
  2. Step 2: Convert to fraction form
    79.41/109.56 = 51.81/x
  3. Step 3: Cross multiply
    79.41x = 109.56 × 51.81
  4. Step 4: Simplify right side
    79.41x = 5,676.30
  5. Step 5: Solve for x
    x = 5,676.30/79.41
  6. Step 6: Final answer
    x = 71.48

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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.