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Finding the Fourth Proportional to 1,280.37, 1,767.08 and 749.41

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Solution

The fourth proportional to 1,280.37, 1,767.08 and 749.41 is: 1,034.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.37 : 1,767.08 = 749.41 : x
  2. Step 2: Convert to fraction form
    1,280.37/1,767.08 = 749.41/x
  3. Step 3: Cross multiply
    1,280.37x = 1,767.08 × 749.41
  4. Step 4: Simplify right side
    1,280.37x = 1,324,267.42
  5. Step 5: Solve for x
    x = 1,324,267.42/1,280.37
  6. Step 6: Final answer
    x = 1,034.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.