Home / 20,861.90-28,779.77-18,474.30

Finding the Fourth Proportional to 20,861.90, 28,779.77 and 18,474.30

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Solution

The fourth proportional to 20,861.90, 28,779.77 and 18,474.30 is: 25,485.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.90 : 28,779.77 = 18,474.30 : x
  2. Step 2: Convert to fraction form
    20,861.90/28,779.77 = 18,474.30/x
  3. Step 3: Cross multiply
    20,861.90x = 28,779.77 × 18,474.30
  4. Step 4: Simplify right side
    20,861.90x = 531,686,012.54
  5. Step 5: Solve for x
    x = 531,686,012.54/20,861.90
  6. Step 6: Final answer
    x = 25,485.99

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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.