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Finding the Fourth Proportional to 69.75, 103.97 and 64.28

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Solution

The fourth proportional to 69.75, 103.97 and 64.28 is: 95.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.75 : 103.97 = 64.28 : x
  2. Step 2: Convert to fraction form
    69.75/103.97 = 64.28/x
  3. Step 3: Cross multiply
    69.75x = 103.97 × 64.28
  4. Step 4: Simplify right side
    69.75x = 6,682.35
  5. Step 5: Solve for x
    x = 6,682.35/69.75
  6. Step 6: Final answer
    x = 95.80

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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.