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Finding the Fourth Proportional to 68.12, 102.20 and 25.40

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Solution

The fourth proportional to 68.12, 102.20 and 25.40 is: 38.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.12 : 102.20 = 25.40 : x
  2. Step 2: Convert to fraction form
    68.12/102.20 = 25.40/x
  3. Step 3: Cross multiply
    68.12x = 102.20 × 25.40
  4. Step 4: Simplify right side
    68.12x = 2,595.88
  5. Step 5: Solve for x
    x = 2,595.88/68.12
  6. Step 6: Final answer
    x = 38.11

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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.