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Finding the Fourth Proportional to 28,940.64, 43,435.54 and 20,641

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Solution

The fourth proportional to 28,940.64, 43,435.54 and 20,641 is: 30,979.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,940.64 : 43,435.54 = 20,641 : x
  2. Step 2: Convert to fraction form
    28,940.64/43,435.54 = 20,641/x
  3. Step 3: Cross multiply
    28,940.64x = 43,435.54 × 20,641
  4. Step 4: Simplify right side
    28,940.64x = 896,552,981.14
  5. Step 5: Solve for x
    x = 896,552,981.14/28,940.64
  6. Step 6: Final answer
    x = 30,979.03

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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.