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Finding the Fourth Proportional to 30.20, 41.67 and 19.31

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Solution

The fourth proportional to 30.20, 41.67 and 19.31 is: 26.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.20 : 41.67 = 19.31 : x
  2. Step 2: Convert to fraction form
    30.20/41.67 = 19.31/x
  3. Step 3: Cross multiply
    30.20x = 41.67 × 19.31
  4. Step 4: Simplify right side
    30.20x = 804.44
  5. Step 5: Solve for x
    x = 804.44/30.20
  6. Step 6: Final answer
    x = 26.64

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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.