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Finding the Fourth Proportional to 15.50, 21.11 and 15.23

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Solution

The fourth proportional to 15.50, 21.11 and 15.23 is: 20.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.50 : 21.11 = 15.23 : x
  2. Step 2: Convert to fraction form
    15.50/21.11 = 15.23/x
  3. Step 3: Cross multiply
    15.50x = 21.11 × 15.23
  4. Step 4: Simplify right side
    15.50x = 321.48
  5. Step 5: Solve for x
    x = 321.48/15.50
  6. Step 6: Final answer
    x = 20.74

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.