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Finding the Fourth Proportional to 28,180, 38,889.60 and 15,604.80

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Solution

The fourth proportional to 28,180, 38,889.60 and 15,604.80 is: 21,535.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,180 : 38,889.60 = 15,604.80 : x
  2. Step 2: Convert to fraction form
    28,180/38,889.60 = 15,604.80/x
  3. Step 3: Cross multiply
    28,180x = 38,889.60 × 15,604.80
  4. Step 4: Simplify right side
    28,180x = 606,864,430.08
  5. Step 5: Solve for x
    x = 606,864,430.08/28,180
  6. Step 6: Final answer
    x = 21,535.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.