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Finding the Fourth Proportional to 4,921.76, 7,380.80 and 1,999.08

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Solution

The fourth proportional to 4,921.76, 7,380.80 and 1,999.08 is: 2,997.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,921.76 : 7,380.80 = 1,999.08 : x
  2. Step 2: Convert to fraction form
    4,921.76/7,380.80 = 1,999.08/x
  3. Step 3: Cross multiply
    4,921.76x = 7,380.80 × 1,999.08
  4. Step 4: Simplify right side
    4,921.76x = 14,754,809.66
  5. Step 5: Solve for x
    x = 14,754,809.66/4,921.76
  6. Step 6: Final answer
    x = 2,997.87

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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.