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Finding the Fourth Proportional to 30.34, 41.90 and 20.66

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Solution

The fourth proportional to 30.34, 41.90 and 20.66 is: 28.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.34 : 41.90 = 20.66 : x
  2. Step 2: Convert to fraction form
    30.34/41.90 = 20.66/x
  3. Step 3: Cross multiply
    30.34x = 41.90 × 20.66
  4. Step 4: Simplify right side
    30.34x = 865.65
  5. Step 5: Solve for x
    x = 865.65/30.34
  6. Step 6: Final answer
    x = 28.53

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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.