Home / 20,519.12-30,774.84-12,775.76

Finding the Fourth Proportional to 20,519.12, 30,774.84 and 12,775.76

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Solution

The fourth proportional to 20,519.12, 30,774.84 and 12,775.76 is: 19,161.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,519.12 : 30,774.84 = 12,775.76 : x
  2. Step 2: Convert to fraction form
    20,519.12/30,774.84 = 12,775.76/x
  3. Step 3: Cross multiply
    20,519.12x = 30,774.84 × 12,775.76
  4. Step 4: Simplify right side
    20,519.12x = 393,171,969.88
  5. Step 5: Solve for x
    x = 393,171,969.88/20,519.12
  6. Step 6: Final answer
    x = 19,161.25

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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.