Home / 15,769.87-21,739.78-12,406.86

Finding the Fourth Proportional to 15,769.87, 21,739.78 and 12,406.86

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Solution

The fourth proportional to 15,769.87, 21,739.78 and 12,406.86 is: 17,103.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,769.87 : 21,739.78 = 12,406.86 : x
  2. Step 2: Convert to fraction form
    15,769.87/21,739.78 = 12,406.86/x
  3. Step 3: Cross multiply
    15,769.87x = 21,739.78 × 12,406.86
  4. Step 4: Simplify right side
    15,769.87x = 269,722,406.89
  5. Step 5: Solve for x
    x = 269,722,406.89/15,769.87
  6. Step 6: Final answer
    x = 17,103.65

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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.