Home / 20,891.95-28,820.15-13,720.83

Finding the Fourth Proportional to 20,891.95, 28,820.15 and 13,720.83

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Solution

The fourth proportional to 20,891.95, 28,820.15 and 13,720.83 is: 18,927.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.95 : 28,820.15 = 13,720.83 : x
  2. Step 2: Convert to fraction form
    20,891.95/28,820.15 = 13,720.83/x
  3. Step 3: Cross multiply
    20,891.95x = 28,820.15 × 13,720.83
  4. Step 4: Simplify right side
    20,891.95x = 395,436,378.72
  5. Step 5: Solve for x
    x = 395,436,378.72/20,891.95
  6. Step 6: Final answer
    x = 18,927.69

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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.