Home / 28,535.12-39,379.20-15,786.80

Finding the Fourth Proportional to 28,535.12, 39,379.20 and 15,786.80

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Solution

The fourth proportional to 28,535.12, 39,379.20 and 15,786.80 is: 21,786.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,535.12 : 39,379.20 = 15,786.80 : x
  2. Step 2: Convert to fraction form
    28,535.12/39,379.20 = 15,786.80/x
  3. Step 3: Cross multiply
    28,535.12x = 39,379.20 × 15,786.80
  4. Step 4: Simplify right side
    28,535.12x = 621,671,554.56
  5. Step 5: Solve for x
    x = 621,671,554.56/28,535.12
  6. Step 6: Final answer
    x = 21,786.19

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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.