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Finding the Fourth Proportional to 68.78, 94.91 and 37.69

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Solution

The fourth proportional to 68.78, 94.91 and 37.69 is: 52.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.78 : 94.91 = 37.69 : x
  2. Step 2: Convert to fraction form
    68.78/94.91 = 37.69/x
  3. Step 3: Cross multiply
    68.78x = 94.91 × 37.69
  4. Step 4: Simplify right side
    68.78x = 3,577.38
  5. Step 5: Solve for x
    x = 3,577.38/68.78
  6. Step 6: Final answer
    x = 52.01

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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.