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Finding the Fourth Proportional to 28.29, 42.68 and 28.22

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Solution

The fourth proportional to 28.29, 42.68 and 28.22 is: 42.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.29 : 42.68 = 28.22 : x
  2. Step 2: Convert to fraction form
    28.29/42.68 = 28.22/x
  3. Step 3: Cross multiply
    28.29x = 42.68 × 28.22
  4. Step 4: Simplify right side
    28.29x = 1,204.29
  5. Step 5: Solve for x
    x = 1,204.29/28.29
  6. Step 6: Final answer
    x = 42.57

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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.