Home / 20,811.39-28,719.77-11,379.98

Finding the Fourth Proportional to 20,811.39, 28,719.77 and 11,379.98

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Solution

The fourth proportional to 20,811.39, 28,719.77 and 11,379.98 is: 15,704.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.39 : 28,719.77 = 11,379.98 : x
  2. Step 2: Convert to fraction form
    20,811.39/28,719.77 = 11,379.98/x
  3. Step 3: Cross multiply
    20,811.39x = 28,719.77 × 11,379.98
  4. Step 4: Simplify right side
    20,811.39x = 326,830,207.71
  5. Step 5: Solve for x
    x = 326,830,207.71/20,811.39
  6. Step 6: Final answer
    x = 15,704.39

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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.