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Finding the Fourth Proportional to 68.48, 102.70 and 20.38

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Solution

The fourth proportional to 68.48, 102.70 and 20.38 is: 30.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.48 : 102.70 = 20.38 : x
  2. Step 2: Convert to fraction form
    68.48/102.70 = 20.38/x
  3. Step 3: Cross multiply
    68.48x = 102.70 × 20.38
  4. Step 4: Simplify right side
    68.48x = 2,093.03
  5. Step 5: Solve for x
    x = 2,093.03/68.48
  6. Step 6: Final answer
    x = 30.56

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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.