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Finding the Fourth Proportional to 28.87, 43.30 and 13.65

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Solution

The fourth proportional to 28.87, 43.30 and 13.65 is: 20.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.87 : 43.30 = 13.65 : x
  2. Step 2: Convert to fraction form
    28.87/43.30 = 13.65/x
  3. Step 3: Cross multiply
    28.87x = 43.30 × 13.65
  4. Step 4: Simplify right side
    28.87x = 591.05
  5. Step 5: Solve for x
    x = 591.05/28.87
  6. Step 6: Final answer
    x = 20.47

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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.