Home / 20,856.83-28,784.48-11,905.70

Finding the Fourth Proportional to 20,856.83, 28,784.48 and 11,905.70

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Solution

The fourth proportional to 20,856.83, 28,784.48 and 11,905.70 is: 16,431.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.83 : 28,784.48 = 11,905.70 : x
  2. Step 2: Convert to fraction form
    20,856.83/28,784.48 = 11,905.70/x
  3. Step 3: Cross multiply
    20,856.83x = 28,784.48 × 11,905.70
  4. Step 4: Simplify right side
    20,856.83x = 342,699,180.09
  5. Step 5: Solve for x
    x = 342,699,180.09/20,856.83
  6. Step 6: Final answer
    x = 16,431.03

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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.