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Finding the Fourth Proportional to 14.22, 21.33 and 5.21

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Solution

The fourth proportional to 14.22, 21.33 and 5.21 is: 7.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.22 : 21.33 = 5.21 : x
  2. Step 2: Convert to fraction form
    14.22/21.33 = 5.21/x
  3. Step 3: Cross multiply
    14.22x = 21.33 × 5.21
  4. Step 4: Simplify right side
    14.22x = 111.10
  5. Step 5: Solve for x
    x = 111.10/14.22
  6. Step 6: Final answer
    x = 7.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.