Home / 20,875.80-28,805.58-11,921.88

Finding the Fourth Proportional to 20,875.80, 28,805.58 and 11,921.88

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Solution

The fourth proportional to 20,875.80, 28,805.58 and 11,921.88 is: 16,450.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,875.80 : 28,805.58 = 11,921.88 : x
  2. Step 2: Convert to fraction form
    20,875.80/28,805.58 = 11,921.88/x
  3. Step 3: Cross multiply
    20,875.80x = 28,805.58 × 11,921.88
  4. Step 4: Simplify right side
    20,875.80x = 343,416,668.09
  5. Step 5: Solve for x
    x = 343,416,668.09/20,875.80
  6. Step 6: Final answer
    x = 16,450.47

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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.