Home / 20,806.63-28,705.07-13,251.61

Finding the Fourth Proportional to 20,806.63, 28,705.07 and 13,251.61

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Solution

The fourth proportional to 20,806.63, 28,705.07 and 13,251.61 is: 18,282.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,806.63 : 28,705.07 = 13,251.61 : x
  2. Step 2: Convert to fraction form
    20,806.63/28,705.07 = 13,251.61/x
  3. Step 3: Cross multiply
    20,806.63x = 28,705.07 × 13,251.61
  4. Step 4: Simplify right side
    20,806.63x = 380,388,354.03
  5. Step 5: Solve for x
    x = 380,388,354.03/20,806.63
  6. Step 6: Final answer
    x = 18,282.08

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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.