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Finding the Fourth Proportional to 79.86, 119.00 and 76.37

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Solution

The fourth proportional to 79.86, 119.00 and 76.37 is: 113.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.86 : 119.00 = 76.37 : x
  2. Step 2: Convert to fraction form
    79.86/119.00 = 76.37/x
  3. Step 3: Cross multiply
    79.86x = 119.00 × 76.37
  4. Step 4: Simplify right side
    79.86x = 9,087.95
  5. Step 5: Solve for x
    x = 9,087.95/79.86
  6. Step 6: Final answer
    x = 113.80

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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.