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Finding the Fourth Proportional to 28.99, 43.50 and 13.79

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Solution

The fourth proportional to 28.99, 43.50 and 13.79 is: 20.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.99 : 43.50 = 13.79 : x
  2. Step 2: Convert to fraction form
    28.99/43.50 = 13.79/x
  3. Step 3: Cross multiply
    28.99x = 43.50 × 13.79
  4. Step 4: Simplify right side
    28.99x = 599.61
  5. Step 5: Solve for x
    x = 599.61/28.99
  6. Step 6: Final answer
    x = 20.69

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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.