Home / 20,508.12-28,299.78-12,123

Finding the Fourth Proportional to 20,508.12, 28,299.78 and 12,123

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Solution

The fourth proportional to 20,508.12, 28,299.78 and 12,123 is: 16,728.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,508.12 : 28,299.78 = 12,123 : x
  2. Step 2: Convert to fraction form
    20,508.12/28,299.78 = 12,123/x
  3. Step 3: Cross multiply
    20,508.12x = 28,299.78 × 12,123
  4. Step 4: Simplify right side
    20,508.12x = 343,078,232.94
  5. Step 5: Solve for x
    x = 343,078,232.94/20,508.12
  6. Step 6: Final answer
    x = 16,728.90

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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.