Home / 20,780.41-28,679.03-12,396.91

Finding the Fourth Proportional to 20,780.41, 28,679.03 and 12,396.91

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Solution

The fourth proportional to 20,780.41, 28,679.03 and 12,396.91 is: 17,108.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.41 : 28,679.03 = 12,396.91 : x
  2. Step 2: Convert to fraction form
    20,780.41/28,679.03 = 12,396.91/x
  3. Step 3: Cross multiply
    20,780.41x = 28,679.03 × 12,396.91
  4. Step 4: Simplify right side
    20,780.41x = 355,531,353.80
  5. Step 5: Solve for x
    x = 355,531,353.80/20,780.41
  6. Step 6: Final answer
    x = 17,108.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.