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Finding the Fourth Proportional to 68.36, 102.56 and 66.84

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Solution

The fourth proportional to 68.36, 102.56 and 66.84 is: 100.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.36 : 102.56 = 66.84 : x
  2. Step 2: Convert to fraction form
    68.36/102.56 = 66.84/x
  3. Step 3: Cross multiply
    68.36x = 102.56 × 66.84
  4. Step 4: Simplify right side
    68.36x = 6,854.78
  5. Step 5: Solve for x
    x = 6,854.78/68.36
  6. Step 6: Final answer
    x = 100.28

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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.