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Finding the Fourth Proportional to 1,238.50, 1,858.26 and 544.80

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Solution

The fourth proportional to 1,238.50, 1,858.26 and 544.80 is: 817.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.50 : 1,858.26 = 544.80 : x
  2. Step 2: Convert to fraction form
    1,238.50/1,858.26 = 544.80/x
  3. Step 3: Cross multiply
    1,238.50x = 1,858.26 × 544.80
  4. Step 4: Simplify right side
    1,238.50x = 1,012,380.05
  5. Step 5: Solve for x
    x = 1,012,380.05/1,238.50
  6. Step 6: Final answer
    x = 817.42

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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.