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Finding the Fourth Proportional to 68.56, 94.01 and 64.78

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Solution

The fourth proportional to 68.56, 94.01 and 64.78 is: 88.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.56 : 94.01 = 64.78 : x
  2. Step 2: Convert to fraction form
    68.56/94.01 = 64.78/x
  3. Step 3: Cross multiply
    68.56x = 94.01 × 64.78
  4. Step 4: Simplify right side
    68.56x = 6,089.97
  5. Step 5: Solve for x
    x = 6,089.97/68.56
  6. Step 6: Final answer
    x = 88.83

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.