Home / 20,760.80-28,705.20-18,136.40

Finding the Fourth Proportional to 20,760.80, 28,705.20 and 18,136.40

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Solution

The fourth proportional to 20,760.80, 28,705.20 and 18,136.40 is: 25,076.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,760.80 : 28,705.20 = 18,136.40 : x
  2. Step 2: Convert to fraction form
    20,760.80/28,705.20 = 18,136.40/x
  3. Step 3: Cross multiply
    20,760.80x = 28,705.20 × 18,136.40
  4. Step 4: Simplify right side
    20,760.80x = 520,608,989.28
  5. Step 5: Solve for x
    x = 520,608,989.28/20,760.80
  6. Step 6: Final answer
    x = 25,076.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.