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Finding the Fourth Proportional to 43.11, 64.64 and 20.28

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Solution

The fourth proportional to 43.11, 64.64 and 20.28 is: 30.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.11 : 64.64 = 20.28 : x
  2. Step 2: Convert to fraction form
    43.11/64.64 = 20.28/x
  3. Step 3: Cross multiply
    43.11x = 64.64 × 20.28
  4. Step 4: Simplify right side
    43.11x = 1,310.80
  5. Step 5: Solve for x
    x = 1,310.80/43.11
  6. Step 6: Final answer
    x = 30.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.