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Finding the Fourth Proportional to 28,431, 39,234.78 and 15,855.75

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Solution

The fourth proportional to 28,431, 39,234.78 and 15,855.75 is: 21,880.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,431 : 39,234.78 = 15,855.75 : x
  2. Step 2: Convert to fraction form
    28,431/39,234.78 = 15,855.75/x
  3. Step 3: Cross multiply
    28,431x = 39,234.78 × 15,855.75
  4. Step 4: Simplify right side
    28,431x = 622,096,862.99
  5. Step 5: Solve for x
    x = 622,096,862.99/28,431
  6. Step 6: Final answer
    x = 21,880.94

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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.