Home / 20,840.63-28,760.09-11,409.21

Finding the Fourth Proportional to 20,840.63, 28,760.09 and 11,409.21

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Solution

The fourth proportional to 20,840.63, 28,760.09 and 11,409.21 is: 15,744.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.63 : 28,760.09 = 11,409.21 : x
  2. Step 2: Convert to fraction form
    20,840.63/28,760.09 = 11,409.21/x
  3. Step 3: Cross multiply
    20,840.63x = 28,760.09 × 11,409.21
  4. Step 4: Simplify right side
    20,840.63x = 328,129,906.43
  5. Step 5: Solve for x
    x = 328,129,906.43/20,840.63
  6. Step 6: Final answer
    x = 15,744.72

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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.