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Finding the Fourth Proportional to 47.85, 66.05 and 28.19

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Solution

The fourth proportional to 47.85, 66.05 and 28.19 is: 38.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.85 : 66.05 = 28.19 : x
  2. Step 2: Convert to fraction form
    47.85/66.05 = 28.19/x
  3. Step 3: Cross multiply
    47.85x = 66.05 × 28.19
  4. Step 4: Simplify right side
    47.85x = 1,861.95
  5. Step 5: Solve for x
    x = 1,861.95/47.85
  6. Step 6: Final answer
    x = 38.91

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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.