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Finding the Fourth Proportional to 45.35, 67.99 and 20.97

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Solution

The fourth proportional to 45.35, 67.99 and 20.97 is: 31.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.35 : 67.99 = 20.97 : x
  2. Step 2: Convert to fraction form
    45.35/67.99 = 20.97/x
  3. Step 3: Cross multiply
    45.35x = 67.99 × 20.97
  4. Step 4: Simplify right side
    45.35x = 1,425.80
  5. Step 5: Solve for x
    x = 1,425.80/45.35
  6. Step 6: Final answer
    x = 31.44

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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.