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Finding the Fourth Proportional to 79.19, 117.96 and 74.21

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Solution

The fourth proportional to 79.19, 117.96 and 74.21 is: 110.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.19 : 117.96 = 74.21 : x
  2. Step 2: Convert to fraction form
    79.19/117.96 = 74.21/x
  3. Step 3: Cross multiply
    79.19x = 117.96 × 74.21
  4. Step 4: Simplify right side
    79.19x = 8,753.22
  5. Step 5: Solve for x
    x = 8,753.22/79.19
  6. Step 6: Final answer
    x = 110.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.