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Finding the Fourth Proportional to 30.30, 41.81 and 21.54

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Solution

The fourth proportional to 30.30, 41.81 and 21.54 is: 29.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.30 : 41.81 = 21.54 : x
  2. Step 2: Convert to fraction form
    30.30/41.81 = 21.54/x
  3. Step 3: Cross multiply
    30.30x = 41.81 × 21.54
  4. Step 4: Simplify right side
    30.30x = 900.48
  5. Step 5: Solve for x
    x = 900.48/30.30
  6. Step 6: Final answer
    x = 29.72

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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.