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Finding the Fourth Proportional to 15.34, 21.20 and 11.73

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Solution

The fourth proportional to 15.34, 21.20 and 11.73 is: 16.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.34 : 21.20 = 11.73 : x
  2. Step 2: Convert to fraction form
    15.34/21.20 = 11.73/x
  3. Step 3: Cross multiply
    15.34x = 21.20 × 11.73
  4. Step 4: Simplify right side
    15.34x = 248.58
  5. Step 5: Solve for x
    x = 248.58/15.34
  6. Step 6: Final answer
    x = 16.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.