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Finding the Fourth Proportional to 28.73, 39.67 and 19.05

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Solution

The fourth proportional to 28.73, 39.67 and 19.05 is: 26.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.73 : 39.67 = 19.05 : x
  2. Step 2: Convert to fraction form
    28.73/39.67 = 19.05/x
  3. Step 3: Cross multiply
    28.73x = 39.67 × 19.05
  4. Step 4: Simplify right side
    28.73x = 755.71
  5. Step 5: Solve for x
    x = 755.71/28.73
  6. Step 6: Final answer
    x = 26.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.