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Finding the Fourth Proportional to 21.74, 30.05 and 14.83

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Solution

The fourth proportional to 21.74, 30.05 and 14.83 is: 20.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.74 : 30.05 = 14.83 : x
  2. Step 2: Convert to fraction form
    21.74/30.05 = 14.83/x
  3. Step 3: Cross multiply
    21.74x = 30.05 × 14.83
  4. Step 4: Simplify right side
    21.74x = 445.68
  5. Step 5: Solve for x
    x = 445.68/21.74
  6. Step 6: Final answer
    x = 20.50

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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.