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Finding the Fourth Proportional to 79.83, 119.64 and 31.68

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Solution

The fourth proportional to 79.83, 119.64 and 31.68 is: 47.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.83 : 119.64 = 31.68 : x
  2. Step 2: Convert to fraction form
    79.83/119.64 = 31.68/x
  3. Step 3: Cross multiply
    79.83x = 119.64 × 31.68
  4. Step 4: Simplify right side
    79.83x = 3,790.20
  5. Step 5: Solve for x
    x = 3,790.20/79.83
  6. Step 6: Final answer
    x = 47.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.