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Finding the Fourth Proportional to 113.78, 170.60 and 68.12

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Solution

The fourth proportional to 113.78, 170.60 and 68.12 is: 102.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.78 : 170.60 = 68.12 : x
  2. Step 2: Convert to fraction form
    113.78/170.60 = 68.12/x
  3. Step 3: Cross multiply
    113.78x = 170.60 × 68.12
  4. Step 4: Simplify right side
    113.78x = 11,620.08
  5. Step 5: Solve for x
    x = 11,620.08/113.78
  6. Step 6: Final answer
    x = 102.13

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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.