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Finding the Fourth Proportional to 9.15, 12.63 and 6.43

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Solution

The fourth proportional to 9.15, 12.63 and 6.43 is: 8.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.15 : 12.63 = 6.43 : x
  2. Step 2: Convert to fraction form
    9.15/12.63 = 6.43/x
  3. Step 3: Cross multiply
    9.15x = 12.63 × 6.43
  4. Step 4: Simplify right side
    9.15x = 81.21
  5. Step 5: Solve for x
    x = 81.21/9.15
  6. Step 6: Final answer
    x = 8.88

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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.