Home / 21,589.20-29,928.96-20,406.60

Finding the Fourth Proportional to 21,589.20, 29,928.96 and 20,406.60

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Solution

The fourth proportional to 21,589.20, 29,928.96 and 20,406.60 is: 28,289.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,589.20 : 29,928.96 = 20,406.60 : x
  2. Step 2: Convert to fraction form
    21,589.20/29,928.96 = 20,406.60/x
  3. Step 3: Cross multiply
    21,589.20x = 29,928.96 × 20,406.60
  4. Step 4: Simplify right side
    21,589.20x = 610,748,315.14
  5. Step 5: Solve for x
    x = 610,748,315.14/21,589.20
  6. Step 6: Final answer
    x = 28,289.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.