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Finding the Fourth Proportional to 79.98, 119.94 and 31.88

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Solution

The fourth proportional to 79.98, 119.94 and 31.88 is: 47.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.98 : 119.94 = 31.88 : x
  2. Step 2: Convert to fraction form
    79.98/119.94 = 31.88/x
  3. Step 3: Cross multiply
    79.98x = 119.94 × 31.88
  4. Step 4: Simplify right side
    79.98x = 3,823.09
  5. Step 5: Solve for x
    x = 3,823.09/79.98
  6. Step 6: Final answer
    x = 47.80

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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.