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Finding the Fourth Proportional to 28,641.92, 42,945.53 and 12,843.99

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Solution

The fourth proportional to 28,641.92, 42,945.53 and 12,843.99 is: 19,258.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,641.92 : 42,945.53 = 12,843.99 : x
  2. Step 2: Convert to fraction form
    28,641.92/42,945.53 = 12,843.99/x
  3. Step 3: Cross multiply
    28,641.92x = 42,945.53 × 12,843.99
  4. Step 4: Simplify right side
    28,641.92x = 551,591,893.64
  5. Step 5: Solve for x
    x = 551,591,893.64/28,641.92
  6. Step 6: Final answer
    x = 19,258.21

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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.