Home / 20,409.76-28,169.40-11,912.88

Finding the Fourth Proportional to 20,409.76, 28,169.40 and 11,912.88

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Solution

The fourth proportional to 20,409.76, 28,169.40 and 11,912.88 is: 16,442.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,409.76 : 28,169.40 = 11,912.88 : x
  2. Step 2: Convert to fraction form
    20,409.76/28,169.40 = 11,912.88/x
  3. Step 3: Cross multiply
    20,409.76x = 28,169.40 × 11,912.88
  4. Step 4: Simplify right side
    20,409.76x = 335,578,681.87
  5. Step 5: Solve for x
    x = 335,578,681.87/20,409.76
  6. Step 6: Final answer
    x = 16,442.07

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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.