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Finding the Fourth Proportional to 281.19, 421.89 and 190.26

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Solution

The fourth proportional to 281.19, 421.89 and 190.26 is: 285.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.19 : 421.89 = 190.26 : x
  2. Step 2: Convert to fraction form
    281.19/421.89 = 190.26/x
  3. Step 3: Cross multiply
    281.19x = 421.89 × 190.26
  4. Step 4: Simplify right side
    281.19x = 80,268.79
  5. Step 5: Solve for x
    x = 80,268.79/281.19
  6. Step 6: Final answer
    x = 285.46

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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.