Home / 20,753.04-31,120.70-7,921.80

Finding the Fourth Proportional to 20,753.04, 31,120.70 and 7,921.80

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Solution

The fourth proportional to 20,753.04, 31,120.70 and 7,921.80 is: 11,879.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,753.04 : 31,120.70 = 7,921.80 : x
  2. Step 2: Convert to fraction form
    20,753.04/31,120.70 = 7,921.80/x
  3. Step 3: Cross multiply
    20,753.04x = 31,120.70 × 7,921.80
  4. Step 4: Simplify right side
    20,753.04x = 246,531,961.26
  5. Step 5: Solve for x
    x = 246,531,961.26/20,753.04
  6. Step 6: Final answer
    x = 11,879.32

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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.