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Finding the Fourth Proportional to 28.46, 39.21 and 27.18

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Solution

The fourth proportional to 28.46, 39.21 and 27.18 is: 37.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.46 : 39.21 = 27.18 : x
  2. Step 2: Convert to fraction form
    28.46/39.21 = 27.18/x
  3. Step 3: Cross multiply
    28.46x = 39.21 × 27.18
  4. Step 4: Simplify right side
    28.46x = 1,065.73
  5. Step 5: Solve for x
    x = 1,065.73/28.46
  6. Step 6: Final answer
    x = 37.45

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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.