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Finding the Fourth Proportional to 28.43, 42.49 and 26.75

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Solution

The fourth proportional to 28.43, 42.49 and 26.75 is: 39.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.43 : 42.49 = 26.75 : x
  2. Step 2: Convert to fraction form
    28.43/42.49 = 26.75/x
  3. Step 3: Cross multiply
    28.43x = 42.49 × 26.75
  4. Step 4: Simplify right side
    28.43x = 1,136.75
  5. Step 5: Solve for x
    x = 1,136.75/28.43
  6. Step 6: Final answer
    x = 39.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.