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Finding the Fourth Proportional to 3,328.78, 4,993.14 and 1,276.78

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Solution

The fourth proportional to 3,328.78, 4,993.14 and 1,276.78 is: 1,915.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,328.78 : 4,993.14 = 1,276.78 : x
  2. Step 2: Convert to fraction form
    3,328.78/4,993.14 = 1,276.78/x
  3. Step 3: Cross multiply
    3,328.78x = 4,993.14 × 1,276.78
  4. Step 4: Simplify right side
    3,328.78x = 6,375,141.29
  5. Step 5: Solve for x
    x = 6,375,141.29/3,328.78
  6. Step 6: Final answer
    x = 1,915.16

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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.