Home / 20,478.60-30,711.90-7,995.78

Finding the Fourth Proportional to 20,478.60, 30,711.90 and 7,995.78

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Solution

The fourth proportional to 20,478.60, 30,711.90 and 7,995.78 is: 11,991.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.60 : 30,711.90 = 7,995.78 : x
  2. Step 2: Convert to fraction form
    20,478.60/30,711.90 = 7,995.78/x
  3. Step 3: Cross multiply
    20,478.60x = 30,711.90 × 7,995.78
  4. Step 4: Simplify right side
    20,478.60x = 245,565,595.78
  5. Step 5: Solve for x
    x = 245,565,595.78/20,478.60
  6. Step 6: Final answer
    x = 11,991.33

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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.