Home / 20,835.88-28,754.12-11,405.05

Finding the Fourth Proportional to 20,835.88, 28,754.12 and 11,405.05

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Solution

The fourth proportional to 20,835.88, 28,754.12 and 11,405.05 is: 15,739.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,835.88 : 28,754.12 = 11,405.05 : x
  2. Step 2: Convert to fraction form
    20,835.88/28,754.12 = 11,405.05/x
  3. Step 3: Cross multiply
    20,835.88x = 28,754.12 × 11,405.05
  4. Step 4: Simplify right side
    20,835.88x = 327,942,176.31
  5. Step 5: Solve for x
    x = 327,942,176.31/20,835.88
  6. Step 6: Final answer
    x = 15,739.30

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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.