Home / 20,639.28-30,980.76-12,853.56

Finding the Fourth Proportional to 20,639.28, 30,980.76 and 12,853.56

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Solution

The fourth proportional to 20,639.28, 30,980.76 and 12,853.56 is: 19,293.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.28 : 30,980.76 = 12,853.56 : x
  2. Step 2: Convert to fraction form
    20,639.28/30,980.76 = 12,853.56/x
  3. Step 3: Cross multiply
    20,639.28x = 30,980.76 × 12,853.56
  4. Step 4: Simplify right side
    20,639.28x = 398,213,057.51
  5. Step 5: Solve for x
    x = 398,213,057.51/20,639.28
  6. Step 6: Final answer
    x = 19,293.94

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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.