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Finding the Fourth Proportional to 84.78, 116.80 and 68.38

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Solution

The fourth proportional to 84.78, 116.80 and 68.38 is: 94.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.78 : 116.80 = 68.38 : x
  2. Step 2: Convert to fraction form
    84.78/116.80 = 68.38/x
  3. Step 3: Cross multiply
    84.78x = 116.80 × 68.38
  4. Step 4: Simplify right side
    84.78x = 7,986.78
  5. Step 5: Solve for x
    x = 7,986.78/84.78
  6. Step 6: Final answer
    x = 94.21

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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.