Home / 20,859.42-28,785.84-11,427.78

Finding the Fourth Proportional to 20,859.42, 28,785.84 and 11,427.78

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Solution

The fourth proportional to 20,859.42, 28,785.84 and 11,427.78 is: 15,770.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.42 : 28,785.84 = 11,427.78 : x
  2. Step 2: Convert to fraction form
    20,859.42/28,785.84 = 11,427.78/x
  3. Step 3: Cross multiply
    20,859.42x = 28,785.84 × 11,427.78
  4. Step 4: Simplify right side
    20,859.42x = 328,958,246.64
  5. Step 5: Solve for x
    x = 328,958,246.64/20,859.42
  6. Step 6: Final answer
    x = 15,770.25

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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.