Home / 20,661.72-28,513.26-12,278.28

Finding the Fourth Proportional to 20,661.72, 28,513.26 and 12,278.28

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Solution

The fourth proportional to 20,661.72, 28,513.26 and 12,278.28 is: 16,944.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.72 : 28,513.26 = 12,278.28 : x
  2. Step 2: Convert to fraction form
    20,661.72/28,513.26 = 12,278.28/x
  3. Step 3: Cross multiply
    20,661.72x = 28,513.26 × 12,278.28
  4. Step 4: Simplify right side
    20,661.72x = 350,093,789.99
  5. Step 5: Solve for x
    x = 350,093,789.99/20,661.72
  6. Step 6: Final answer
    x = 16,944.08

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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.