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Finding the Fourth Proportional to 28.70, 43.04 and 13.49

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Solution

The fourth proportional to 28.70, 43.04 and 13.49 is: 20.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.70 : 43.04 = 13.49 : x
  2. Step 2: Convert to fraction form
    28.70/43.04 = 13.49/x
  3. Step 3: Cross multiply
    28.70x = 43.04 × 13.49
  4. Step 4: Simplify right side
    28.70x = 580.61
  5. Step 5: Solve for x
    x = 580.61/28.70
  6. Step 6: Final answer
    x = 20.23

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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.