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Finding the Fourth Proportional to 68.88, 94.95 and 54.15

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Solution

The fourth proportional to 68.88, 94.95 and 54.15 is: 74.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.88 : 94.95 = 54.15 : x
  2. Step 2: Convert to fraction form
    68.88/94.95 = 54.15/x
  3. Step 3: Cross multiply
    68.88x = 94.95 × 54.15
  4. Step 4: Simplify right side
    68.88x = 5,141.54
  5. Step 5: Solve for x
    x = 5,141.54/68.88
  6. Step 6: Final answer
    x = 74.64

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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.