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Finding the Fourth Proportional to 1,280.68, 1,767.22 and 749.62

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Solution

The fourth proportional to 1,280.68, 1,767.22 and 749.62 is: 1,034.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.68 : 1,767.22 = 749.62 : x
  2. Step 2: Convert to fraction form
    1,280.68/1,767.22 = 749.62/x
  3. Step 3: Cross multiply
    1,280.68x = 1,767.22 × 749.62
  4. Step 4: Simplify right side
    1,280.68x = 1,324,743.79
  5. Step 5: Solve for x
    x = 1,324,743.79/1,280.68
  6. Step 6: Final answer
    x = 1,034.41

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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.