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Finding the Fourth Proportional to 20,571.80, 30,779.70 and 13,659.80

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Solution

The fourth proportional to 20,571.80, 30,779.70 and 13,659.80 is: 20,437.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,571.80 : 30,779.70 = 13,659.80 : x
  2. Step 2: Convert to fraction form
    20,571.80/30,779.70 = 13,659.80/x
  3. Step 3: Cross multiply
    20,571.80x = 30,779.70 × 13,659.80
  4. Step 4: Simplify right side
    20,571.80x = 420,444,546.06
  5. Step 5: Solve for x
    x = 420,444,546.06/20,571.80
  6. Step 6: Final answer
    x = 20,437.91

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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.