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Finding the Fourth Proportional to 68.94, 102.75 and 66.39

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Solution

The fourth proportional to 68.94, 102.75 and 66.39 is: 98.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.94 : 102.75 = 66.39 : x
  2. Step 2: Convert to fraction form
    68.94/102.75 = 66.39/x
  3. Step 3: Cross multiply
    68.94x = 102.75 × 66.39
  4. Step 4: Simplify right side
    68.94x = 6,821.57
  5. Step 5: Solve for x
    x = 6,821.57/68.94
  6. Step 6: Final answer
    x = 98.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.