Home / 20,857.09-28,781.67-11,423.83

Finding the Fourth Proportional to 20,857.09, 28,781.67 and 11,423.83

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Solution

The fourth proportional to 20,857.09, 28,781.67 and 11,423.83 is: 15,764.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.09 : 28,781.67 = 11,423.83 : x
  2. Step 2: Convert to fraction form
    20,857.09/28,781.67 = 11,423.83/x
  3. Step 3: Cross multiply
    20,857.09x = 28,781.67 × 11,423.83
  4. Step 4: Simplify right side
    20,857.09x = 328,796,905.20
  5. Step 5: Solve for x
    x = 328,796,905.20/20,857.09
  6. Step 6: Final answer
    x = 15,764.28

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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.