Home / 20,800.80-31,136.40-12,009.60

Finding the Fourth Proportional to 20,800.80, 31,136.40 and 12,009.60

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Solution

The fourth proportional to 20,800.80, 31,136.40 and 12,009.60 is: 17,976.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,800.80 : 31,136.40 = 12,009.60 : x
  2. Step 2: Convert to fraction form
    20,800.80/31,136.40 = 12,009.60/x
  3. Step 3: Cross multiply
    20,800.80x = 31,136.40 × 12,009.60
  4. Step 4: Simplify right side
    20,800.80x = 373,935,709.44
  5. Step 5: Solve for x
    x = 373,935,709.44/20,800.80
  6. Step 6: Final answer
    x = 17,976.99

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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.