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Finding the Fourth Proportional to 9.30, 12.21 and 9.30

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Solution

The fourth proportional to 9.30, 12.21 and 9.30 is: 12.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.30 : 12.21 = 9.30 : x
  2. Step 2: Convert to fraction form
    9.30/12.21 = 9.30/x
  3. Step 3: Cross multiply
    9.30x = 12.21 × 9.30
  4. Step 4: Simplify right side
    9.30x = 113.55
  5. Step 5: Solve for x
    x = 113.55/9.30
  6. Step 6: Final answer
    x = 12.21

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.