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Finding the Fourth Proportional to 28.91, 39.92 and 27.90

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Solution

The fourth proportional to 28.91, 39.92 and 27.90 is: 38.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.91 : 39.92 = 27.90 : x
  2. Step 2: Convert to fraction form
    28.91/39.92 = 27.90/x
  3. Step 3: Cross multiply
    28.91x = 39.92 × 27.90
  4. Step 4: Simplify right side
    28.91x = 1,113.77
  5. Step 5: Solve for x
    x = 1,113.77/28.91
  6. Step 6: Final answer
    x = 38.53

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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.