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Finding the Fourth Proportional to 28.26, 42.39 and 14.02

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Solution

The fourth proportional to 28.26, 42.39 and 14.02 is: 21.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.26 : 42.39 = 14.02 : x
  2. Step 2: Convert to fraction form
    28.26/42.39 = 14.02/x
  3. Step 3: Cross multiply
    28.26x = 42.39 × 14.02
  4. Step 4: Simplify right side
    28.26x = 594.31
  5. Step 5: Solve for x
    x = 594.31/28.26
  6. Step 6: Final answer
    x = 21.03

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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.