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Finding the Fourth Proportional to 1,940.60, 2,910.88 and 786.08

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Solution

The fourth proportional to 1,940.60, 2,910.88 and 786.08 is: 1,179.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.60 : 2,910.88 = 786.08 : x
  2. Step 2: Convert to fraction form
    1,940.60/2,910.88 = 786.08/x
  3. Step 3: Cross multiply
    1,940.60x = 2,910.88 × 786.08
  4. Step 4: Simplify right side
    1,940.60x = 2,288,184.55
  5. Step 5: Solve for x
    x = 2,288,184.55/1,940.60
  6. Step 6: Final answer
    x = 1,179.11

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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.