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Finding the Fourth Proportional to 2,718.40, 4,078.80 and 1,256.80

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Solution

The fourth proportional to 2,718.40, 4,078.80 and 1,256.80 is: 1,885.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,718.40 : 4,078.80 = 1,256.80 : x
  2. Step 2: Convert to fraction form
    2,718.40/4,078.80 = 1,256.80/x
  3. Step 3: Cross multiply
    2,718.40x = 4,078.80 × 1,256.80
  4. Step 4: Simplify right side
    2,718.40x = 5,126,235.84
  5. Step 5: Solve for x
    x = 5,126,235.84/2,718.40
  6. Step 6: Final answer
    x = 1,885.75

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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.