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Finding the Fourth Proportional to 79.86, 118.74 and 76.62

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Solution

The fourth proportional to 79.86, 118.74 and 76.62 is: 113.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.86 : 118.74 = 76.62 : x
  2. Step 2: Convert to fraction form
    79.86/118.74 = 76.62/x
  3. Step 3: Cross multiply
    79.86x = 118.74 × 76.62
  4. Step 4: Simplify right side
    79.86x = 9,097.86
  5. Step 5: Solve for x
    x = 9,097.86/79.86
  6. Step 6: Final answer
    x = 113.92

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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.