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Finding the Fourth Proportional to 68.38, 94.36 and 42.55

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Solution

The fourth proportional to 68.38, 94.36 and 42.55 is: 58.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.38 : 94.36 = 42.55 : x
  2. Step 2: Convert to fraction form
    68.38/94.36 = 42.55/x
  3. Step 3: Cross multiply
    68.38x = 94.36 × 42.55
  4. Step 4: Simplify right side
    68.38x = 4,014.55
  5. Step 5: Solve for x
    x = 4,014.55/68.38
  6. Step 6: Final answer
    x = 58.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.