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Finding the Fourth Proportional to 68.76, 94.48 and 65.75

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Solution

The fourth proportional to 68.76, 94.48 and 65.75 is: 90.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.76 : 94.48 = 65.75 : x
  2. Step 2: Convert to fraction form
    68.76/94.48 = 65.75/x
  3. Step 3: Cross multiply
    68.76x = 94.48 × 65.75
  4. Step 4: Simplify right side
    68.76x = 6,211.42
  5. Step 5: Solve for x
    x = 6,211.42/68.76
  6. Step 6: Final answer
    x = 90.33

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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.