Home / 20,999.20-31,513.20-9,320.80

Finding the Fourth Proportional to 20,999.20, 31,513.20 and 9,320.80

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Solution

The fourth proportional to 20,999.20, 31,513.20 and 9,320.80 is: 13,987.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.20 : 31,513.20 = 9,320.80 : x
  2. Step 2: Convert to fraction form
    20,999.20/31,513.20 = 9,320.80/x
  3. Step 3: Cross multiply
    20,999.20x = 31,513.20 × 9,320.80
  4. Step 4: Simplify right side
    20,999.20x = 293,728,234.56
  5. Step 5: Solve for x
    x = 293,728,234.56/20,999.20
  6. Step 6: Final answer
    x = 13,987.59

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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.