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Finding the Fourth Proportional to 79.31, 109.49 and 51.73

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Solution

The fourth proportional to 79.31, 109.49 and 51.73 is: 71.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.31 : 109.49 = 51.73 : x
  2. Step 2: Convert to fraction form
    79.31/109.49 = 51.73/x
  3. Step 3: Cross multiply
    79.31x = 109.49 × 51.73
  4. Step 4: Simplify right side
    79.31x = 5,663.39
  5. Step 5: Solve for x
    x = 5,663.39/79.31
  6. Step 6: Final answer
    x = 71.41

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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.