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Finding the Fourth Proportional to 2,718.70, 4,078.21 and 770.75

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Solution

The fourth proportional to 2,718.70, 4,078.21 and 770.75 is: 1,156.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,718.70 : 4,078.21 = 770.75 : x
  2. Step 2: Convert to fraction form
    2,718.70/4,078.21 = 770.75/x
  3. Step 3: Cross multiply
    2,718.70x = 4,078.21 × 770.75
  4. Step 4: Simplify right side
    2,718.70x = 3,143,276.50
  5. Step 5: Solve for x
    x = 3,143,276.50/2,718.70
  6. Step 6: Final answer
    x = 1,156.17

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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.