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Finding the Fourth Proportional to 11.20, 15 and 11.20

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Solution

The fourth proportional to 11.20, 15 and 11.20 is: 15.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.20 : 15 = 11.20 : x
  2. Step 2: Convert to fraction form
    11.20/15 = 11.20/x
  3. Step 3: Cross multiply
    11.20x = 15 × 11.20
  4. Step 4: Simplify right side
    11.20x = 168
  5. Step 5: Solve for x
    x = 168/11.20
  6. Step 6: Final answer
    x = 15.00

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.