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Finding the Fourth Proportional to 28,940.80, 43,428.42 and 12,929.08

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Solution

The fourth proportional to 28,940.80, 43,428.42 and 12,929.08 is: 19,401.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,940.80 : 43,428.42 = 12,929.08 : x
  2. Step 2: Convert to fraction form
    28,940.80/43,428.42 = 12,929.08/x
  3. Step 3: Cross multiply
    28,940.80x = 43,428.42 × 12,929.08
  4. Step 4: Simplify right side
    28,940.80x = 561,489,516.45
  5. Step 5: Solve for x
    x = 561,489,516.45/28,940.80
  6. Step 6: Final answer
    x = 19,401.31

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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.