Home / 20,855.09-28,778.91-11,421.83

Finding the Fourth Proportional to 20,855.09, 28,778.91 and 11,421.83

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Solution

The fourth proportional to 20,855.09, 28,778.91 and 11,421.83 is: 15,761.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.09 : 28,778.91 = 11,421.83 : x
  2. Step 2: Convert to fraction form
    20,855.09/28,778.91 = 11,421.83/x
  3. Step 3: Cross multiply
    20,855.09x = 28,778.91 × 11,421.83
  4. Step 4: Simplify right side
    20,855.09x = 328,707,817.61
  5. Step 5: Solve for x
    x = 328,707,817.61/20,855.09
  6. Step 6: Final answer
    x = 15,761.52

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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.