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Finding the Fourth Proportional to 28.34, 42.75 and 28.03

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Solution

The fourth proportional to 28.34, 42.75 and 28.03 is: 42.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.34 : 42.75 = 28.03 : x
  2. Step 2: Convert to fraction form
    28.34/42.75 = 28.03/x
  3. Step 3: Cross multiply
    28.34x = 42.75 × 28.03
  4. Step 4: Simplify right side
    28.34x = 1,198.28
  5. Step 5: Solve for x
    x = 1,198.28/28.34
  6. Step 6: Final answer
    x = 42.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.