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Finding the Fourth Proportional to 2,619.66, 3,930.12 and 770.84

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Solution

The fourth proportional to 2,619.66, 3,930.12 and 770.84 is: 1,156.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.66 : 3,930.12 = 770.84 : x
  2. Step 2: Convert to fraction form
    2,619.66/3,930.12 = 770.84/x
  3. Step 3: Cross multiply
    2,619.66x = 3,930.12 × 770.84
  4. Step 4: Simplify right side
    2,619.66x = 3,029,493.70
  5. Step 5: Solve for x
    x = 3,029,493.70/2,619.66
  6. Step 6: Final answer
    x = 1,156.45

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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.