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Finding the Fourth Proportional to 28,908.80, 43,363.20 and 18,540.80

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Solution

The fourth proportional to 28,908.80, 43,363.20 and 18,540.80 is: 27,811.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,908.80 : 43,363.20 = 18,540.80 : x
  2. Step 2: Convert to fraction form
    28,908.80/43,363.20 = 18,540.80/x
  3. Step 3: Cross multiply
    28,908.80x = 43,363.20 × 18,540.80
  4. Step 4: Simplify right side
    28,908.80x = 803,988,418.56
  5. Step 5: Solve for x
    x = 803,988,418.56/28,908.80
  6. Step 6: Final answer
    x = 27,811.20

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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.