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Finding the Fourth Proportional to 68.28, 94.34 and 65.76

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Solution

The fourth proportional to 68.28, 94.34 and 65.76 is: 90.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.28 : 94.34 = 65.76 : x
  2. Step 2: Convert to fraction form
    68.28/94.34 = 65.76/x
  3. Step 3: Cross multiply
    68.28x = 94.34 × 65.76
  4. Step 4: Simplify right side
    68.28x = 6,203.80
  5. Step 5: Solve for x
    x = 6,203.80/68.28
  6. Step 6: Final answer
    x = 90.86

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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.