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Finding the Fourth Proportional to 9.90, 13.65 and 6.44

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Solution

The fourth proportional to 9.90, 13.65 and 6.44 is: 8.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.90 : 13.65 = 6.44 : x
  2. Step 2: Convert to fraction form
    9.90/13.65 = 6.44/x
  3. Step 3: Cross multiply
    9.90x = 13.65 × 6.44
  4. Step 4: Simplify right side
    9.90x = 87.88
  5. Step 5: Solve for x
    x = 87.88/9.90
  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.