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Finding the Fourth Proportional to 8.89, 12.25 and 8.21

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Solution

The fourth proportional to 8.89, 12.25 and 8.21 is: 11.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.89 : 12.25 = 8.21 : x
  2. Step 2: Convert to fraction form
    8.89/12.25 = 8.21/x
  3. Step 3: Cross multiply
    8.89x = 12.25 × 8.21
  4. Step 4: Simplify right side
    8.89x = 100.61
  5. Step 5: Solve for x
    x = 100.61/8.89
  6. Step 6: Final answer
    x = 11.32

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Double scale
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1.5x scale

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.