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Finding the Fourth Proportional to 20,357.91, 28,093.74 and 11,405.49

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Solution

The fourth proportional to 20,357.91, 28,093.74 and 11,405.49 is: 15,739.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,357.91 : 28,093.74 = 11,405.49 : x
  2. Step 2: Convert to fraction form
    20,357.91/28,093.74 = 11,405.49/x
  3. Step 3: Cross multiply
    20,357.91x = 28,093.74 × 11,405.49
  4. Step 4: Simplify right side
    20,357.91x = 320,422,870.63
  5. Step 5: Solve for x
    x = 320,422,870.63/20,357.91
  6. Step 6: Final answer
    x = 15,739.48

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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.