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Finding the Fourth Proportional to 68.56, 102.78 and 25.20

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Solution

The fourth proportional to 68.56, 102.78 and 25.20 is: 37.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.56 : 102.78 = 25.20 : x
  2. Step 2: Convert to fraction form
    68.56/102.78 = 25.20/x
  3. Step 3: Cross multiply
    68.56x = 102.78 × 25.20
  4. Step 4: Simplify right side
    68.56x = 2,590.13
  5. Step 5: Solve for x
    x = 2,590.13/68.56
  6. Step 6: Final answer
    x = 37.78

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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.