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Finding the Fourth Proportional to 281.01, 421.66 and 212.51

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Solution

The fourth proportional to 281.01, 421.66 and 212.51 is: 318.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.01 : 421.66 = 212.51 : x
  2. Step 2: Convert to fraction form
    281.01/421.66 = 212.51/x
  3. Step 3: Cross multiply
    281.01x = 421.66 × 212.51
  4. Step 4: Simplify right side
    281.01x = 89,606.97
  5. Step 5: Solve for x
    x = 89,606.97/281.01
  6. Step 6: Final answer
    x = 318.87

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.