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Finding the Fourth Proportional to 281.20, 421.72 and 190.45

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Solution

The fourth proportional to 281.20, 421.72 and 190.45 is: 285.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.20 : 421.72 = 190.45 : x
  2. Step 2: Convert to fraction form
    281.20/421.72 = 190.45/x
  3. Step 3: Cross multiply
    281.20x = 421.72 × 190.45
  4. Step 4: Simplify right side
    281.20x = 80,316.57
  5. Step 5: Solve for x
    x = 80,316.57/281.20
  6. Step 6: Final answer
    x = 285.62

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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.