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Finding the Fourth Proportional to 28.46, 39.24 and 18.74

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Solution

The fourth proportional to 28.46, 39.24 and 18.74 is: 25.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.46 : 39.24 = 18.74 : x
  2. Step 2: Convert to fraction form
    28.46/39.24 = 18.74/x
  3. Step 3: Cross multiply
    28.46x = 39.24 × 18.74
  4. Step 4: Simplify right side
    28.46x = 735.36
  5. Step 5: Solve for x
    x = 735.36/28.46
  6. Step 6: Final answer
    x = 25.84

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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.