Home / 20,826.14-31,239.20-9,138.44

Finding the Fourth Proportional to 20,826.14, 31,239.20 and 9,138.44

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Solution

The fourth proportional to 20,826.14, 31,239.20 and 9,138.44 is: 13,707.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,826.14 : 31,239.20 = 9,138.44 : x
  2. Step 2: Convert to fraction form
    20,826.14/31,239.20 = 9,138.44/x
  3. Step 3: Cross multiply
    20,826.14x = 31,239.20 × 9,138.44
  4. Step 4: Simplify right side
    20,826.14x = 285,477,554.85
  5. Step 5: Solve for x
    x = 285,477,554.85/20,826.14
  6. Step 6: Final answer
    x = 13,707.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.