Home / 20,863.80-28,790.64-11,911.68

Finding the Fourth Proportional to 20,863.80, 28,790.64 and 11,911.68

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Solution

The fourth proportional to 20,863.80, 28,790.64 and 11,911.68 is: 16,437.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,863.80 : 28,790.64 = 11,911.68 : x
  2. Step 2: Convert to fraction form
    20,863.80/28,790.64 = 11,911.68/x
  3. Step 3: Cross multiply
    20,863.80x = 28,790.64 × 11,911.68
  4. Step 4: Simplify right side
    20,863.80x = 342,944,890.68
  5. Step 5: Solve for x
    x = 342,944,890.68/20,863.80
  6. Step 6: Final answer
    x = 16,437.32

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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.