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Finding the Fourth Proportional to 28.25, 42.35 and 11.12

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Solution

The fourth proportional to 28.25, 42.35 and 11.12 is: 16.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.25 : 42.35 = 11.12 : x
  2. Step 2: Convert to fraction form
    28.25/42.35 = 11.12/x
  3. Step 3: Cross multiply
    28.25x = 42.35 × 11.12
  4. Step 4: Simplify right side
    28.25x = 471.07
  5. Step 5: Solve for x
    x = 471.07/28.25
  6. Step 6: Final answer
    x = 16.67

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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.