Home / 20,705.40-31,060.20-6,661.80

Finding the Fourth Proportional to 20,705.40, 31,060.20 and 6,661.80

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Solution

The fourth proportional to 20,705.40, 31,060.20 and 6,661.80 is: 9,993.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,705.40 : 31,060.20 = 6,661.80 : x
  2. Step 2: Convert to fraction form
    20,705.40/31,060.20 = 6,661.80/x
  3. Step 3: Cross multiply
    20,705.40x = 31,060.20 × 6,661.80
  4. Step 4: Simplify right side
    20,705.40x = 206,916,840.36
  5. Step 5: Solve for x
    x = 206,916,840.36/20,705.40
  6. Step 6: Final answer
    x = 9,993.38

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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.