Home / 20,379.28-28,123.50-11,887.28

Finding the Fourth Proportional to 20,379.28, 28,123.50 and 11,887.28

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Solution

The fourth proportional to 20,379.28, 28,123.50 and 11,887.28 is: 16,404.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.28 : 28,123.50 = 11,887.28 : x
  2. Step 2: Convert to fraction form
    20,379.28/28,123.50 = 11,887.28/x
  3. Step 3: Cross multiply
    20,379.28x = 28,123.50 × 11,887.28
  4. Step 4: Simplify right side
    20,379.28x = 334,311,919.08
  5. Step 5: Solve for x
    x = 334,311,919.08/20,379.28
  6. Step 6: Final answer
    x = 16,404.50

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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.