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Finding the Fourth Proportional to 9.63, 13.28 and 6.39

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Solution

The fourth proportional to 9.63, 13.28 and 6.39 is: 8.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.63 : 13.28 = 6.39 : x
  2. Step 2: Convert to fraction form
    9.63/13.28 = 6.39/x
  3. Step 3: Cross multiply
    9.63x = 13.28 × 6.39
  4. Step 4: Simplify right side
    9.63x = 84.86
  5. Step 5: Solve for x
    x = 84.86/9.63
  6. Step 6: Final answer
    x = 8.81

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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.