Home / 20,999.12-31,480.80-9,305.96

Finding the Fourth Proportional to 20,999.12, 31,480.80 and 9,305.96

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Solution

The fourth proportional to 20,999.12, 31,480.80 and 9,305.96 is: 13,951.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.12 : 31,480.80 = 9,305.96 : x
  2. Step 2: Convert to fraction form
    20,999.12/31,480.80 = 9,305.96/x
  3. Step 3: Cross multiply
    20,999.12x = 31,480.80 × 9,305.96
  4. Step 4: Simplify right side
    20,999.12x = 292,959,065.57
  5. Step 5: Solve for x
    x = 292,959,065.57/20,999.12
  6. Step 6: Final answer
    x = 13,951.02

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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.