Home / 20,620.86-28,457.37-12,123.56

Finding the Fourth Proportional to 20,620.86, 28,457.37 and 12,123.56

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Solution

The fourth proportional to 20,620.86, 28,457.37 and 12,123.56 is: 16,730.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.86 : 28,457.37 = 12,123.56 : x
  2. Step 2: Convert to fraction form
    20,620.86/28,457.37 = 12,123.56/x
  3. Step 3: Cross multiply
    20,620.86x = 28,457.37 × 12,123.56
  4. Step 4: Simplify right side
    20,620.86x = 345,004,490.35
  5. Step 5: Solve for x
    x = 345,004,490.35/20,620.86
  6. Step 6: Final answer
    x = 16,730.85

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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.