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Finding the Fourth Proportional to 11.12, 16.65 and 9.21

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Solution

The fourth proportional to 11.12, 16.65 and 9.21 is: 13.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.12 : 16.65 = 9.21 : x
  2. Step 2: Convert to fraction form
    11.12/16.65 = 9.21/x
  3. Step 3: Cross multiply
    11.12x = 16.65 × 9.21
  4. Step 4: Simplify right side
    11.12x = 153.35
  5. Step 5: Solve for x
    x = 153.35/11.12
  6. Step 6: Final answer
    x = 13.80

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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.