Home / 20,684.72-31,029.20-12,891.44

Finding the Fourth Proportional to 20,684.72, 31,029.20 and 12,891.44

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Solution

The fourth proportional to 20,684.72, 31,029.20 and 12,891.44 is: 19,338.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,684.72 : 31,029.20 = 12,891.44 : x
  2. Step 2: Convert to fraction form
    20,684.72/31,029.20 = 12,891.44/x
  3. Step 3: Cross multiply
    20,684.72x = 31,029.20 × 12,891.44
  4. Step 4: Simplify right side
    20,684.72x = 400,011,070.05
  5. Step 5: Solve for x
    x = 400,011,070.05/20,684.72
  6. Step 6: Final answer
    x = 19,338.48

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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.