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Finding the Fourth Proportional to 30.27, 45.38 and 20.61

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Solution

The fourth proportional to 30.27, 45.38 and 20.61 is: 30.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.27 : 45.38 = 20.61 : x
  2. Step 2: Convert to fraction form
    30.27/45.38 = 20.61/x
  3. Step 3: Cross multiply
    30.27x = 45.38 × 20.61
  4. Step 4: Simplify right side
    30.27x = 935.28
  5. Step 5: Solve for x
    x = 935.28/30.27
  6. Step 6: Final answer
    x = 30.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.