Home / 20,821.77-28,734.26-11,390.13

Finding the Fourth Proportional to 20,821.77, 28,734.26 and 11,390.13

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Solution

The fourth proportional to 20,821.77, 28,734.26 and 11,390.13 is: 15,718.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.77 : 28,734.26 = 11,390.13 : x
  2. Step 2: Convert to fraction form
    20,821.77/28,734.26 = 11,390.13/x
  3. Step 3: Cross multiply
    20,821.77x = 28,734.26 × 11,390.13
  4. Step 4: Simplify right side
    20,821.77x = 327,286,956.85
  5. Step 5: Solve for x
    x = 327,286,956.85/20,821.77
  6. Step 6: Final answer
    x = 15,718.50

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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.