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Finding the Fourth Proportional to 28.22, 42.12 and 24.30

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Solution

The fourth proportional to 28.22, 42.12 and 24.30 is: 36.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.22 : 42.12 = 24.30 : x
  2. Step 2: Convert to fraction form
    28.22/42.12 = 24.30/x
  3. Step 3: Cross multiply
    28.22x = 42.12 × 24.30
  4. Step 4: Simplify right side
    28.22x = 1,023.52
  5. Step 5: Solve for x
    x = 1,023.52/28.22
  6. Step 6: Final answer
    x = 36.28

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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.