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Finding the Fourth Proportional to 28,571.90, 42,869.12 and 8,851.99

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Solution

The fourth proportional to 28,571.90, 42,869.12 and 8,851.99 is: 13,281.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,571.90 : 42,869.12 = 8,851.99 : x
  2. Step 2: Convert to fraction form
    28,571.90/42,869.12 = 8,851.99/x
  3. Step 3: Cross multiply
    28,571.90x = 42,869.12 × 8,851.99
  4. Step 4: Simplify right side
    28,571.90x = 379,477,021.55
  5. Step 5: Solve for x
    x = 379,477,021.55/28,571.90
  6. Step 6: Final answer
    x = 13,281.48

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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.