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Finding the Fourth Proportional to 19, 28.56 and 12.28

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Solution

The fourth proportional to 19, 28.56 and 12.28 is: 18.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    19 : 28.56 = 12.28 : x
  2. Step 2: Convert to fraction form
    19/28.56 = 12.28/x
  3. Step 3: Cross multiply
    19x = 28.56 × 12.28
  4. Step 4: Simplify right side
    19x = 350.72
  5. Step 5: Solve for x
    x = 350.72/19
  6. Step 6: Final answer
    x = 18.46

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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.