Home / 20,764.80-31,147.20-12,891.60

Finding the Fourth Proportional to 20,764.80, 31,147.20 and 12,891.60

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Solution

The fourth proportional to 20,764.80, 31,147.20 and 12,891.60 is: 19,337.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,764.80 : 31,147.20 = 12,891.60 : x
  2. Step 2: Convert to fraction form
    20,764.80/31,147.20 = 12,891.60/x
  3. Step 3: Cross multiply
    20,764.80x = 31,147.20 × 12,891.60
  4. Step 4: Simplify right side
    20,764.80x = 401,537,243.52
  5. Step 5: Solve for x
    x = 401,537,243.52/20,764.80
  6. Step 6: Final answer
    x = 19,337.40

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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.