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Finding the Fourth Proportional to 18,721.77, 28,074.84 and 7,620.94

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Solution

The fourth proportional to 18,721.77, 28,074.84 and 7,620.94 is: 11,428.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.77 : 28,074.84 = 7,620.94 : x
  2. Step 2: Convert to fraction form
    18,721.77/28,074.84 = 7,620.94/x
  3. Step 3: Cross multiply
    18,721.77x = 28,074.84 × 7,620.94
  4. Step 4: Simplify right side
    18,721.77x = 213,956,671.15
  5. Step 5: Solve for x
    x = 213,956,671.15/18,721.77
  6. Step 6: Final answer
    x = 11,428.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.