Home / 20,489.40-30,741.36-6,638.40

Finding the Fourth Proportional to 20,489.40, 30,741.36 and 6,638.40

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Solution

The fourth proportional to 20,489.40, 30,741.36 and 6,638.40 is: 9,959.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.40 : 30,741.36 = 6,638.40 : x
  2. Step 2: Convert to fraction form
    20,489.40/30,741.36 = 6,638.40/x
  3. Step 3: Cross multiply
    20,489.40x = 30,741.36 × 6,638.40
  4. Step 4: Simplify right side
    20,489.40x = 204,073,444.22
  5. Step 5: Solve for x
    x = 204,073,444.22/20,489.40
  6. Step 6: Final answer
    x = 9,959.95

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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.