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Finding the Fourth Proportional to 2,940.20, 4,410.65 and 991.88

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Solution

The fourth proportional to 2,940.20, 4,410.65 and 991.88 is: 1,487.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,940.20 : 4,410.65 = 991.88 : x
  2. Step 2: Convert to fraction form
    2,940.20/4,410.65 = 991.88/x
  3. Step 3: Cross multiply
    2,940.20x = 4,410.65 × 991.88
  4. Step 4: Simplify right side
    2,940.20x = 4,374,815.95
  5. Step 5: Solve for x
    x = 4,374,815.95/2,940.20
  6. Step 6: Final answer
    x = 1,487.93

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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.