Home / 27,890.09-38,455.79-20,804.21

Finding the Fourth Proportional to 27,890.09, 38,455.79 and 20,804.21

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Solution

The fourth proportional to 27,890.09, 38,455.79 and 20,804.21 is: 28,685.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,890.09 : 38,455.79 = 20,804.21 : x
  2. Step 2: Convert to fraction form
    27,890.09/38,455.79 = 20,804.21/x
  3. Step 3: Cross multiply
    27,890.09x = 38,455.79 × 20,804.21
  4. Step 4: Simplify right side
    27,890.09x = 800,042,034.58
  5. Step 5: Solve for x
    x = 800,042,034.58/27,890.09
  6. Step 6: Final answer
    x = 28,685.54

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Half scale
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Double scale
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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.