Home / 20,890.20-28,828.10-11,815.42

Finding the Fourth Proportional to 20,890.20, 28,828.10 and 11,815.42

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Solution

The fourth proportional to 20,890.20, 28,828.10 and 11,815.42 is: 16,305.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.20 : 28,828.10 = 11,815.42 : x
  2. Step 2: Convert to fraction form
    20,890.20/28,828.10 = 11,815.42/x
  3. Step 3: Cross multiply
    20,890.20x = 28,828.10 × 11,815.42
  4. Step 4: Simplify right side
    20,890.20x = 340,616,109.30
  5. Step 5: Solve for x
    x = 340,616,109.30/20,890.20
  6. Step 6: Final answer
    x = 16,305.07

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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.