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Finding the Fourth Proportional to 38.35, 52.91 and 21.98

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Solution

The fourth proportional to 38.35, 52.91 and 21.98 is: 30.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.35 : 52.91 = 21.98 : x
  2. Step 2: Convert to fraction form
    38.35/52.91 = 21.98/x
  3. Step 3: Cross multiply
    38.35x = 52.91 × 21.98
  4. Step 4: Simplify right side
    38.35x = 1,162.88
  5. Step 5: Solve for x
    x = 1,162.88/38.35
  6. Step 6: Final answer
    x = 30.33

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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.