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Finding the Fourth Proportional to 28,589.87, 42,867.43 and 12,791.95

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Solution

The fourth proportional to 28,589.87, 42,867.43 and 12,791.95 is: 19,180.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,589.87 : 42,867.43 = 12,791.95 : x
  2. Step 2: Convert to fraction form
    28,589.87/42,867.43 = 12,791.95/x
  3. Step 3: Cross multiply
    28,589.87x = 42,867.43 × 12,791.95
  4. Step 4: Simplify right side
    28,589.87x = 548,358,090.76
  5. Step 5: Solve for x
    x = 548,358,090.76/28,589.87
  6. Step 6: Final answer
    x = 19,180.16

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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.