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Finding the Fourth Proportional to 29.63, 40.65 and 28.22

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Solution

The fourth proportional to 29.63, 40.65 and 28.22 is: 38.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.63 : 40.65 = 28.22 : x
  2. Step 2: Convert to fraction form
    29.63/40.65 = 28.22/x
  3. Step 3: Cross multiply
    29.63x = 40.65 × 28.22
  4. Step 4: Simplify right side
    29.63x = 1,146.99
  5. Step 5: Solve for x
    x = 1,146.99/29.63
  6. Step 6: Final answer
    x = 38.71

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.