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Finding the Fourth Proportional to 20,604.80, 30,916.80 and 15,420.80

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Solution

The fourth proportional to 20,604.80, 30,916.80 and 15,420.80 is: 23,138.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,604.80 : 30,916.80 = 15,420.80 : x
  2. Step 2: Convert to fraction form
    20,604.80/30,916.80 = 15,420.80/x
  3. Step 3: Cross multiply
    20,604.80x = 30,916.80 × 15,420.80
  4. Step 4: Simplify right side
    20,604.80x = 476,761,789.44
  5. Step 5: Solve for x
    x = 476,761,789.44/20,604.80
  6. Step 6: Final answer
    x = 23,138.38

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1.5x scale

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.