Home / 20,990.85-31,321.82-18,784.41

Finding the Fourth Proportional to 20,990.85, 31,321.82 and 18,784.41

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Solution

The fourth proportional to 20,990.85, 31,321.82 and 18,784.41 is: 28,029.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.85 : 31,321.82 = 18,784.41 : x
  2. Step 2: Convert to fraction form
    20,990.85/31,321.82 = 18,784.41/x
  3. Step 3: Cross multiply
    20,990.85x = 31,321.82 × 18,784.41
  4. Step 4: Simplify right side
    20,990.85x = 588,361,908.83
  5. Step 5: Solve for x
    x = 588,361,908.83/20,990.85
  6. Step 6: Final answer
    x = 28,029.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.