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Finding the Fourth Proportional to 281.21, 421.79 and 125.08

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Solution

The fourth proportional to 281.21, 421.79 and 125.08 is: 187.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.21 : 421.79 = 125.08 : x
  2. Step 2: Convert to fraction form
    281.21/421.79 = 125.08/x
  3. Step 3: Cross multiply
    281.21x = 421.79 × 125.08
  4. Step 4: Simplify right side
    281.21x = 52,755.81
  5. Step 5: Solve for x
    x = 52,755.81/281.21
  6. Step 6: Final answer
    x = 187.61

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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.