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Finding the Fourth Proportional to 78.81, 108.44 and 68.41

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Solution

The fourth proportional to 78.81, 108.44 and 68.41 is: 94.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.81 : 108.44 = 68.41 : x
  2. Step 2: Convert to fraction form
    78.81/108.44 = 68.41/x
  3. Step 3: Cross multiply
    78.81x = 108.44 × 68.41
  4. Step 4: Simplify right side
    78.81x = 7,418.38
  5. Step 5: Solve for x
    x = 7,418.38/78.81
  6. Step 6: Final answer
    x = 94.13

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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.