Home / 20,421.12-28,181.08-11,922.60

Finding the Fourth Proportional to 20,421.12, 28,181.08 and 11,922.60

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Solution

The fourth proportional to 20,421.12, 28,181.08 and 11,922.60 is: 16,453.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.12 : 28,181.08 = 11,922.60 : x
  2. Step 2: Convert to fraction form
    20,421.12/28,181.08 = 11,922.60/x
  3. Step 3: Cross multiply
    20,421.12x = 28,181.08 × 11,922.60
  4. Step 4: Simplify right side
    20,421.12x = 335,991,744.41
  5. Step 5: Solve for x
    x = 335,991,744.41/20,421.12
  6. Step 6: Final answer
    x = 16,453.15

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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.