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Finding the Fourth Proportional to 28.99, 43.73 and 28.39

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Solution

The fourth proportional to 28.99, 43.73 and 28.39 is: 42.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.99 : 43.73 = 28.39 : x
  2. Step 2: Convert to fraction form
    28.99/43.73 = 28.39/x
  3. Step 3: Cross multiply
    28.99x = 43.73 × 28.39
  4. Step 4: Simplify right side
    28.99x = 1,241.49
  5. Step 5: Solve for x
    x = 1,241.49/28.99
  6. Step 6: Final answer
    x = 42.82

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.