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Finding the Fourth Proportional to 30.21, 45.05 and 28.54

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Solution

The fourth proportional to 30.21, 45.05 and 28.54 is: 42.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.21 : 45.05 = 28.54 : x
  2. Step 2: Convert to fraction form
    30.21/45.05 = 28.54/x
  3. Step 3: Cross multiply
    30.21x = 45.05 × 28.54
  4. Step 4: Simplify right side
    30.21x = 1,285.73
  5. Step 5: Solve for x
    x = 1,285.73/30.21
  6. Step 6: Final answer
    x = 42.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.