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Finding the Fourth Proportional to 79.05, 117.51 and 76.62

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Solution

The fourth proportional to 79.05, 117.51 and 76.62 is: 113.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.05 : 117.51 = 76.62 : x
  2. Step 2: Convert to fraction form
    79.05/117.51 = 76.62/x
  3. Step 3: Cross multiply
    79.05x = 117.51 × 76.62
  4. Step 4: Simplify right side
    79.05x = 9,003.62
  5. Step 5: Solve for x
    x = 9,003.62/79.05
  6. Step 6: Final answer
    x = 113.90

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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.