Home / 20,857.92-28,784.30-11,425.88

Finding the Fourth Proportional to 20,857.92, 28,784.30 and 11,425.88

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Solution

The fourth proportional to 20,857.92, 28,784.30 and 11,425.88 is: 15,767.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.92 : 28,784.30 = 11,425.88 : x
  2. Step 2: Convert to fraction form
    20,857.92/28,784.30 = 11,425.88/x
  3. Step 3: Cross multiply
    20,857.92x = 28,784.30 × 11,425.88
  4. Step 4: Simplify right side
    20,857.92x = 328,885,756.63
  5. Step 5: Solve for x
    x = 328,885,756.63/20,857.92
  6. Step 6: Final answer
    x = 15,767.91

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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.