Home / 20,858.85-28,785.27-11,427.42

Finding the Fourth Proportional to 20,858.85, 28,785.27 and 11,427.42

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Solution

The fourth proportional to 20,858.85, 28,785.27 and 11,427.42 is: 15,769.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.85 : 28,785.27 = 11,427.42 : x
  2. Step 2: Convert to fraction form
    20,858.85/28,785.27 = 11,427.42/x
  3. Step 3: Cross multiply
    20,858.85x = 28,785.27 × 11,427.42
  4. Step 4: Simplify right side
    20,858.85x = 328,941,370.10
  5. Step 5: Solve for x
    x = 328,941,370.10/20,858.85
  6. Step 6: Final answer
    x = 15,769.87

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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.