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Finding the Fourth Proportional to 28.87, 43.55 and 28.64

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Solution

The fourth proportional to 28.87, 43.55 and 28.64 is: 43.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.87 : 43.55 = 28.64 : x
  2. Step 2: Convert to fraction form
    28.87/43.55 = 28.64/x
  3. Step 3: Cross multiply
    28.87x = 43.55 × 28.64
  4. Step 4: Simplify right side
    28.87x = 1,247.27
  5. Step 5: Solve for x
    x = 1,247.27/28.87
  6. Step 6: Final answer
    x = 43.20

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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.