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Finding the Fourth Proportional to 69.28, 103.18 and 67.36

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Solution

The fourth proportional to 69.28, 103.18 and 67.36 is: 100.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.28 : 103.18 = 67.36 : x
  2. Step 2: Convert to fraction form
    69.28/103.18 = 67.36/x
  3. Step 3: Cross multiply
    69.28x = 103.18 × 67.36
  4. Step 4: Simplify right side
    69.28x = 6,950.20
  5. Step 5: Solve for x
    x = 6,950.20/69.28
  6. Step 6: Final answer
    x = 100.32

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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.