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Finding the Fourth Proportional to 20,907.77, 28,854.77 and 11,956.59

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Solution

The fourth proportional to 20,907.77, 28,854.77 and 11,956.59 is: 16,501.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,907.77 : 28,854.77 = 11,956.59 : x
  2. Step 2: Convert to fraction form
    20,907.77/28,854.77 = 11,956.59/x
  3. Step 3: Cross multiply
    20,907.77x = 28,854.77 × 11,956.59
  4. Step 4: Simplify right side
    20,907.77x = 345,004,594.65
  5. Step 5: Solve for x
    x = 345,004,594.65/20,907.77
  6. Step 6: Final answer
    x = 16,501.27

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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.