Home / 20,280.78-30,428.46-12,480.48

Finding the Fourth Proportional to 20,280.78, 30,428.46 and 12,480.48

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Solution

The fourth proportional to 20,280.78, 30,428.46 and 12,480.48 is: 18,725.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,280.78 : 30,428.46 = 12,480.48 : x
  2. Step 2: Convert to fraction form
    20,280.78/30,428.46 = 12,480.48/x
  3. Step 3: Cross multiply
    20,280.78x = 30,428.46 × 12,480.48
  4. Step 4: Simplify right side
    20,280.78x = 379,761,786.46
  5. Step 5: Solve for x
    x = 379,761,786.46/20,280.78
  6. Step 6: Final answer
    x = 18,725.21

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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.