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Finding the Fourth Proportional to 20,907.92, 28,819.68 and 15,855.92

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Solution

The fourth proportional to 20,907.92, 28,819.68 and 15,855.92 is: 21,855.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,907.92 : 28,819.68 = 15,855.92 : x
  2. Step 2: Convert to fraction form
    20,907.92/28,819.68 = 15,855.92/x
  3. Step 3: Cross multiply
    20,907.92x = 28,819.68 × 15,855.92
  4. Step 4: Simplify right side
    20,907.92x = 456,962,540.51
  5. Step 5: Solve for x
    x = 456,962,540.51/20,907.92
  6. Step 6: Final answer
    x = 21,855.95

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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.