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Finding the Fourth Proportional to 79.05, 108.99 and 52.79

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Solution

The fourth proportional to 79.05, 108.99 and 52.79 is: 72.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.05 : 108.99 = 52.79 : x
  2. Step 2: Convert to fraction form
    79.05/108.99 = 52.79/x
  3. Step 3: Cross multiply
    79.05x = 108.99 × 52.79
  4. Step 4: Simplify right side
    79.05x = 5,753.04
  5. Step 5: Solve for x
    x = 5,753.04/79.05
  6. Step 6: Final answer
    x = 72.78

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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.