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Finding the Fourth Proportional to 6.63, 9.96 and 5.21

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Solution

The fourth proportional to 6.63, 9.96 and 5.21 is: 7.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.63 : 9.96 = 5.21 : x
  2. Step 2: Convert to fraction form
    6.63/9.96 = 5.21/x
  3. Step 3: Cross multiply
    6.63x = 9.96 × 5.21
  4. Step 4: Simplify right side
    6.63x = 51.89
  5. Step 5: Solve for x
    x = 51.89/6.63
  6. Step 6: Final answer
    x = 7.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.