Home / 20,890.95-28,818.77-13,719.83

Finding the Fourth Proportional to 20,890.95, 28,818.77 and 13,719.83

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Solution

The fourth proportional to 20,890.95, 28,818.77 and 13,719.83 is: 18,926.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.95 : 28,818.77 = 13,719.83 : x
  2. Step 2: Convert to fraction form
    20,890.95/28,818.77 = 13,719.83/x
  3. Step 3: Cross multiply
    20,890.95x = 28,818.77 × 13,719.83
  4. Step 4: Simplify right side
    20,890.95x = 395,388,651.80
  5. Step 5: Solve for x
    x = 395,388,651.80/20,890.95
  6. Step 6: Final answer
    x = 18,926.32

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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.