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Finding the Fourth Proportional to 2,718.66, 4,078.08 and 770.88

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Solution

The fourth proportional to 2,718.66, 4,078.08 and 770.88 is: 1,156.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,718.66 : 4,078.08 = 770.88 : x
  2. Step 2: Convert to fraction form
    2,718.66/4,078.08 = 770.88/x
  3. Step 3: Cross multiply
    2,718.66x = 4,078.08 × 770.88
  4. Step 4: Simplify right side
    2,718.66x = 3,143,710.31
  5. Step 5: Solve for x
    x = 3,143,710.31/2,718.66
  6. Step 6: Final answer
    x = 1,156.35

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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.