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Finding the Fourth Proportional to 38.57, 57.78 and 28.95

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Solution

The fourth proportional to 38.57, 57.78 and 28.95 is: 43.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.57 : 57.78 = 28.95 : x
  2. Step 2: Convert to fraction form
    38.57/57.78 = 28.95/x
  3. Step 3: Cross multiply
    38.57x = 57.78 × 28.95
  4. Step 4: Simplify right side
    38.57x = 1,673.11
  5. Step 5: Solve for x
    x = 1,673.11/38.57
  6. Step 6: Final answer
    x = 43.37

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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.