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Finding the Fourth Proportional to 4,920.78, 7,380.90 and 1,999.32

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Solution

The fourth proportional to 4,920.78, 7,380.90 and 1,999.32 is: 2,998.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,920.78 : 7,380.90 = 1,999.32 : x
  2. Step 2: Convert to fraction form
    4,920.78/7,380.90 = 1,999.32/x
  3. Step 3: Cross multiply
    4,920.78x = 7,380.90 × 1,999.32
  4. Step 4: Simplify right side
    4,920.78x = 14,756,780.99
  5. Step 5: Solve for x
    x = 14,756,780.99/4,920.78
  6. Step 6: Final answer
    x = 2,998.87

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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.