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Finding the Fourth Proportional to 28,811.50, 39,759.87 and 15,563.50

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Solution

The fourth proportional to 28,811.50, 39,759.87 and 15,563.50 is: 21,477.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,811.50 : 39,759.87 = 15,563.50 : x
  2. Step 2: Convert to fraction form
    28,811.50/39,759.87 = 15,563.50/x
  3. Step 3: Cross multiply
    28,811.50x = 39,759.87 × 15,563.50
  4. Step 4: Simplify right side
    28,811.50x = 618,802,736.75
  5. Step 5: Solve for x
    x = 618,802,736.75/28,811.50
  6. Step 6: Final answer
    x = 21,477.63

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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.