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Finding the Fourth Proportional to 1,940.94, 2,909.53 and 770.56

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Solution

The fourth proportional to 1,940.94, 2,909.53 and 770.56 is: 1,155.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.94 : 2,909.53 = 770.56 : x
  2. Step 2: Convert to fraction form
    1,940.94/2,909.53 = 770.56/x
  3. Step 3: Cross multiply
    1,940.94x = 2,909.53 × 770.56
  4. Step 4: Simplify right side
    1,940.94x = 2,241,961.13
  5. Step 5: Solve for x
    x = 2,241,961.13/1,940.94
  6. Step 6: Final answer
    x = 1,155.09

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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.