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Finding the Fourth Proportional to 79.89, 111.01 and 79.05

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Solution

The fourth proportional to 79.89, 111.01 and 79.05 is: 109.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.89 : 111.01 = 79.05 : x
  2. Step 2: Convert to fraction form
    79.89/111.01 = 79.05/x
  3. Step 3: Cross multiply
    79.89x = 111.01 × 79.05
  4. Step 4: Simplify right side
    79.89x = 8,775.28
  5. Step 5: Solve for x
    x = 8,775.28/79.89
  6. Step 6: Final answer
    x = 109.85

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.