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Finding the Fourth Proportional to 11.21, 16.76 and 9.80

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Solution

The fourth proportional to 11.21, 16.76 and 9.80 is: 14.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.21 : 16.76 = 9.80 : x
  2. Step 2: Convert to fraction form
    11.21/16.76 = 9.80/x
  3. Step 3: Cross multiply
    11.21x = 16.76 × 9.80
  4. Step 4: Simplify right side
    11.21x = 164.31
  5. Step 5: Solve for x
    x = 164.31/11.21
  6. Step 6: Final answer
    x = 14.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.