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Finding the Fourth Proportional to 281.61, 421.63 and 212.92

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Solution

The fourth proportional to 281.61, 421.63 and 212.92 is: 318.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.61 : 421.63 = 212.92 : x
  2. Step 2: Convert to fraction form
    281.61/421.63 = 212.92/x
  3. Step 3: Cross multiply
    281.61x = 421.63 × 212.92
  4. Step 4: Simplify right side
    281.61x = 89,773.46
  5. Step 5: Solve for x
    x = 89,773.46/281.61
  6. Step 6: Final answer
    x = 318.79

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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.