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Finding the Fourth Proportional to 45.96, 68.94 and 20.29

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Solution

The fourth proportional to 45.96, 68.94 and 20.29 is: 30.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.96 : 68.94 = 20.29 : x
  2. Step 2: Convert to fraction form
    45.96/68.94 = 20.29/x
  3. Step 3: Cross multiply
    45.96x = 68.94 × 20.29
  4. Step 4: Simplify right side
    45.96x = 1,398.62
  5. Step 5: Solve for x
    x = 1,398.62/45.96
  6. Step 6: Final answer
    x = 30.43

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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.