Home / 28,785.89-39,729.60-21,554.21

Finding the Fourth Proportional to 28,785.89, 39,729.60 and 21,554.21

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Solution

The fourth proportional to 28,785.89, 39,729.60 and 21,554.21 is: 29,748.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,785.89 : 39,729.60 = 21,554.21 : x
  2. Step 2: Convert to fraction form
    28,785.89/39,729.60 = 21,554.21/x
  3. Step 3: Cross multiply
    28,785.89x = 39,729.60 × 21,554.21
  4. Step 4: Simplify right side
    28,785.89x = 856,339,942.97
  5. Step 5: Solve for x
    x = 856,339,942.97/28,785.89
  6. Step 6: Final answer
    x = 29,748.61

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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.