Home / 20,781.37-28,688.99-12,286.09

Finding the Fourth Proportional to 20,781.37, 28,688.99 and 12,286.09

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Solution

The fourth proportional to 20,781.37, 28,688.99 and 12,286.09 is: 16,961.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.37 : 28,688.99 = 12,286.09 : x
  2. Step 2: Convert to fraction form
    20,781.37/28,688.99 = 12,286.09/x
  3. Step 3: Cross multiply
    20,781.37x = 28,688.99 × 12,286.09
  4. Step 4: Simplify right side
    20,781.37x = 352,475,513.15
  5. Step 5: Solve for x
    x = 352,475,513.15/20,781.37
  6. Step 6: Final answer
    x = 16,961.13

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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.