Home / 20,281.78-30,422.40-16,811.74

Finding the Fourth Proportional to 20,281.78, 30,422.40 and 16,811.74

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Solution

The fourth proportional to 20,281.78, 30,422.40 and 16,811.74 is: 25,217.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,281.78 : 30,422.40 = 16,811.74 : x
  2. Step 2: Convert to fraction form
    20,281.78/30,422.40 = 16,811.74/x
  3. Step 3: Cross multiply
    20,281.78x = 30,422.40 × 16,811.74
  4. Step 4: Simplify right side
    20,281.78x = 511,453,478.98
  5. Step 5: Solve for x
    x = 511,453,478.98/20,281.78
  6. Step 6: Final answer
    x = 25,217.39

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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.