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Finding the Fourth Proportional to 28.72, 43.10 and 15.21

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Solution

The fourth proportional to 28.72, 43.10 and 15.21 is: 22.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.72 : 43.10 = 15.21 : x
  2. Step 2: Convert to fraction form
    28.72/43.10 = 15.21/x
  3. Step 3: Cross multiply
    28.72x = 43.10 × 15.21
  4. Step 4: Simplify right side
    28.72x = 655.55
  5. Step 5: Solve for x
    x = 655.55/28.72
  6. Step 6: Final answer
    x = 22.83

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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.