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Finding the Fourth Proportional to 28,375.75, 39,159.75 and 15,800.50

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Solution

The fourth proportional to 28,375.75, 39,159.75 and 15,800.50 is: 21,805.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,375.75 : 39,159.75 = 15,800.50 : x
  2. Step 2: Convert to fraction form
    28,375.75/39,159.75 = 15,800.50/x
  3. Step 3: Cross multiply
    28,375.75x = 39,159.75 × 15,800.50
  4. Step 4: Simplify right side
    28,375.75x = 618,743,629.88
  5. Step 5: Solve for x
    x = 618,743,629.88/28,375.75
  6. Step 6: Final answer
    x = 21,805.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.