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Finding the Fourth Proportional to 30.40, 41.96 and 22.12

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Solution

The fourth proportional to 30.40, 41.96 and 22.12 is: 30.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.40 : 41.96 = 22.12 : x
  2. Step 2: Convert to fraction form
    30.40/41.96 = 22.12/x
  3. Step 3: Cross multiply
    30.40x = 41.96 × 22.12
  4. Step 4: Simplify right side
    30.40x = 928.11
  5. Step 5: Solve for x
    x = 928.11/30.40
  6. Step 6: Final answer
    x = 30.53

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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.