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Finding the Fourth Proportional to 21.89, 30.18 and 17.03

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Solution

The fourth proportional to 21.89, 30.18 and 17.03 is: 23.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.89 : 30.18 = 17.03 : x
  2. Step 2: Convert to fraction form
    21.89/30.18 = 17.03/x
  3. Step 3: Cross multiply
    21.89x = 30.18 × 17.03
  4. Step 4: Simplify right side
    21.89x = 513.97
  5. Step 5: Solve for x
    x = 513.97/21.89
  6. Step 6: Final answer
    x = 23.48

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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.