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Finding the Fourth Proportional to 281.91, 423.05 and 137.55

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Solution

The fourth proportional to 281.91, 423.05 and 137.55 is: 206.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.91 : 423.05 = 137.55 : x
  2. Step 2: Convert to fraction form
    281.91/423.05 = 137.55/x
  3. Step 3: Cross multiply
    281.91x = 423.05 × 137.55
  4. Step 4: Simplify right side
    281.91x = 58,189.84
  5. Step 5: Solve for x
    x = 58,189.84/281.91
  6. Step 6: Final answer
    x = 206.41

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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.