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Finding the Fourth Proportional to 28,821.50, 39,773.67 and 15,573.50

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Solution

The fourth proportional to 28,821.50, 39,773.67 and 15,573.50 is: 21,491.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,821.50 : 39,773.67 = 15,573.50 : x
  2. Step 2: Convert to fraction form
    28,821.50/39,773.67 = 15,573.50/x
  3. Step 3: Cross multiply
    28,821.50x = 39,773.67 × 15,573.50
  4. Step 4: Simplify right side
    28,821.50x = 619,415,249.75
  5. Step 5: Solve for x
    x = 619,415,249.75/28,821.50
  6. Step 6: Final answer
    x = 21,491.43

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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.