Home / 20,970.75-28,939.73-12,018.78

Finding the Fourth Proportional to 20,970.75, 28,939.73 and 12,018.78

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Solution

The fourth proportional to 20,970.75, 28,939.73 and 12,018.78 is: 16,585.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.75 : 28,939.73 = 12,018.78 : x
  2. Step 2: Convert to fraction form
    20,970.75/28,939.73 = 12,018.78/x
  3. Step 3: Cross multiply
    20,970.75x = 28,939.73 × 12,018.78
  4. Step 4: Simplify right side
    20,970.75x = 347,820,255.64
  5. Step 5: Solve for x
    x = 347,820,255.64/20,970.75
  6. Step 6: Final answer
    x = 16,585.97

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1.5x scale

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.