Home / 4,920.80-7,380.88-1,999.36

Finding the Fourth Proportional to 4,920.80, 7,380.88 and 1,999.36

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Solution

The fourth proportional to 4,920.80, 7,380.88 and 1,999.36 is: 2,998.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,920.80 : 7,380.88 = 1,999.36 : x
  2. Step 2: Convert to fraction form
    4,920.80/7,380.88 = 1,999.36/x
  3. Step 3: Cross multiply
    4,920.80x = 7,380.88 × 1,999.36
  4. Step 4: Simplify right side
    4,920.80x = 14,757,036.24
  5. Step 5: Solve for x
    x = 14,757,036.24/4,920.80
  6. Step 6: Final answer
    x = 2,998.91

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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.