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Finding the Fourth Proportional to 28.71, 43.06 and 13.49

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Solution

The fourth proportional to 28.71, 43.06 and 13.49 is: 20.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.71 : 43.06 = 13.49 : x
  2. Step 2: Convert to fraction form
    28.71/43.06 = 13.49/x
  3. Step 3: Cross multiply
    28.71x = 43.06 × 13.49
  4. Step 4: Simplify right side
    28.71x = 580.60
  5. Step 5: Solve for x
    x = 580.60/28.71
  6. Step 6: Final answer
    x = 20.22

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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.