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Finding the Fourth Proportional to 28,940.40, 43,427.87 and 12,928.68

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Solution

The fourth proportional to 28,940.40, 43,427.87 and 12,928.68 is: 19,400.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,940.40 : 43,427.87 = 12,928.68 : x
  2. Step 2: Convert to fraction form
    28,940.40/43,427.87 = 12,928.68/x
  3. Step 3: Cross multiply
    28,940.40x = 43,427.87 × 12,928.68
  4. Step 4: Simplify right side
    28,940.40x = 561,464,969.67
  5. Step 5: Solve for x
    x = 561,464,969.67/28,940.40
  6. Step 6: Final answer
    x = 19,400.73

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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.