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Finding the Fourth Proportional to 1,266.78, 1,900.20 and 717.60

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Solution

The fourth proportional to 1,266.78, 1,900.20 and 717.60 is: 1,076.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.78 : 1,900.20 = 717.60 : x
  2. Step 2: Convert to fraction form
    1,266.78/1,900.20 = 717.60/x
  3. Step 3: Cross multiply
    1,266.78x = 1,900.20 × 717.60
  4. Step 4: Simplify right side
    1,266.78x = 1,363,583.52
  5. Step 5: Solve for x
    x = 1,363,583.52/1,266.78
  6. Step 6: Final answer
    x = 1,076.42

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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.