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Finding the Fourth Proportional to 283.20, 424.44 and 138.80

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Solution

The fourth proportional to 283.20, 424.44 and 138.80 is: 208.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.20 : 424.44 = 138.80 : x
  2. Step 2: Convert to fraction form
    283.20/424.44 = 138.80/x
  3. Step 3: Cross multiply
    283.20x = 424.44 × 138.80
  4. Step 4: Simplify right side
    283.20x = 58,912.27
  5. Step 5: Solve for x
    x = 58,912.27/283.20
  6. Step 6: Final answer
    x = 208.02

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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.