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Finding the Fourth Proportional to 21.83, 29.90 and 21.06

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Solution

The fourth proportional to 21.83, 29.90 and 21.06 is: 28.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.83 : 29.90 = 21.06 : x
  2. Step 2: Convert to fraction form
    21.83/29.90 = 21.06/x
  3. Step 3: Cross multiply
    21.83x = 29.90 × 21.06
  4. Step 4: Simplify right side
    21.83x = 629.69
  5. Step 5: Solve for x
    x = 629.69/21.83
  6. Step 6: Final answer
    x = 28.85

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.