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Finding the Fourth Proportional to 28,668.95, 42,986.60 and 8,672.43

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Solution

The fourth proportional to 28,668.95, 42,986.60 and 8,672.43 is: 13,003.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,668.95 : 42,986.60 = 8,672.43 : x
  2. Step 2: Convert to fraction form
    28,668.95/42,986.60 = 8,672.43/x
  3. Step 3: Cross multiply
    28,668.95x = 42,986.60 × 8,672.43
  4. Step 4: Simplify right side
    28,668.95x = 372,798,236.08
  5. Step 5: Solve for x
    x = 372,798,236.08/28,668.95
  6. Step 6: Final answer
    x = 13,003.56

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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.