Home / 20,853.78-28,778.13-11,901.39

Finding the Fourth Proportional to 20,853.78, 28,778.13 and 11,901.39

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Solution

The fourth proportional to 20,853.78, 28,778.13 and 11,901.39 is: 16,423.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,853.78 : 28,778.13 = 11,901.39 : x
  2. Step 2: Convert to fraction form
    20,853.78/28,778.13 = 11,901.39/x
  3. Step 3: Cross multiply
    20,853.78x = 28,778.13 × 11,901.39
  4. Step 4: Simplify right side
    20,853.78x = 342,499,748.60
  5. Step 5: Solve for x
    x = 342,499,748.60/20,853.78
  6. Step 6: Final answer
    x = 16,423.87

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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.