Home / 20,811.06-28,719.39-11,379.66

Finding the Fourth Proportional to 20,811.06, 28,719.39 and 11,379.66

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Solution

The fourth proportional to 20,811.06, 28,719.39 and 11,379.66 is: 15,704.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.06 : 28,719.39 = 11,379.66 : x
  2. Step 2: Convert to fraction form
    20,811.06/28,719.39 = 11,379.66/x
  3. Step 3: Cross multiply
    20,811.06x = 28,719.39 × 11,379.66
  4. Step 4: Simplify right side
    20,811.06x = 326,816,893.61
  5. Step 5: Solve for x
    x = 326,816,893.61/20,811.06
  6. Step 6: Final answer
    x = 15,704.00

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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.