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Finding the Fourth Proportional to 79.11, 117.81 and 74.46

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Solution

The fourth proportional to 79.11, 117.81 and 74.46 is: 110.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.11 : 117.81 = 74.46 : x
  2. Step 2: Convert to fraction form
    79.11/117.81 = 74.46/x
  3. Step 3: Cross multiply
    79.11x = 117.81 × 74.46
  4. Step 4: Simplify right side
    79.11x = 8,772.13
  5. Step 5: Solve for x
    x = 8,772.13/79.11
  6. Step 6: Final answer
    x = 110.89

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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.