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Finding the Fourth Proportional to 21.76, 30.01 and 19.33

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Solution

The fourth proportional to 21.76, 30.01 and 19.33 is: 26.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.76 : 30.01 = 19.33 : x
  2. Step 2: Convert to fraction form
    21.76/30.01 = 19.33/x
  3. Step 3: Cross multiply
    21.76x = 30.01 × 19.33
  4. Step 4: Simplify right side
    21.76x = 580.09
  5. Step 5: Solve for x
    x = 580.09/21.76
  6. Step 6: Final answer
    x = 26.66

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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.