Home / 20,766.80-31,150.20-19,859.60

Finding the Fourth Proportional to 20,766.80, 31,150.20 and 19,859.60

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Solution

The fourth proportional to 20,766.80, 31,150.20 and 19,859.60 is: 29,789.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,766.80 : 31,150.20 = 19,859.60 : x
  2. Step 2: Convert to fraction form
    20,766.80/31,150.20 = 19,859.60/x
  3. Step 3: Cross multiply
    20,766.80x = 31,150.20 × 19,859.60
  4. Step 4: Simplify right side
    20,766.80x = 618,630,511.92
  5. Step 5: Solve for x
    x = 618,630,511.92/20,766.80
  6. Step 6: Final answer
    x = 29,789.40

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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.