Home / 20,780.38-31,191.36-10,940.41

Finding the Fourth Proportional to 20,780.38, 31,191.36 and 10,940.41

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Solution

The fourth proportional to 20,780.38, 31,191.36 and 10,940.41 is: 16,421.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.38 : 31,191.36 = 10,940.41 : x
  2. Step 2: Convert to fraction form
    20,780.38/31,191.36 = 10,940.41/x
  3. Step 3: Cross multiply
    20,780.38x = 31,191.36 × 10,940.41
  4. Step 4: Simplify right side
    20,780.38x = 341,246,266.86
  5. Step 5: Solve for x
    x = 341,246,266.86/20,780.38
  6. Step 6: Final answer
    x = 16,421.56

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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.