Home / 20,672.78-28,529.68-12,180.56

Finding the Fourth Proportional to 20,672.78, 28,529.68 and 12,180.56

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Solution

The fourth proportional to 20,672.78, 28,529.68 and 12,180.56 is: 16,809.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,672.78 : 28,529.68 = 12,180.56 : x
  2. Step 2: Convert to fraction form
    20,672.78/28,529.68 = 12,180.56/x
  3. Step 3: Cross multiply
    20,672.78x = 28,529.68 × 12,180.56
  4. Step 4: Simplify right side
    20,672.78x = 347,507,570.77
  5. Step 5: Solve for x
    x = 347,507,570.77/20,672.78
  6. Step 6: Final answer
    x = 16,809.91

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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.