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Finding the Fourth Proportional to 30.45, 41.96 and 20.07

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Solution

The fourth proportional to 30.45, 41.96 and 20.07 is: 27.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.45 : 41.96 = 20.07 : x
  2. Step 2: Convert to fraction form
    30.45/41.96 = 20.07/x
  3. Step 3: Cross multiply
    30.45x = 41.96 × 20.07
  4. Step 4: Simplify right side
    30.45x = 842.17
  5. Step 5: Solve for x
    x = 842.17/30.45
  6. Step 6: Final answer
    x = 27.66

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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.