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Finding the Fourth Proportional to 1,275.67, 1,912.29 and 409.38

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Solution

The fourth proportional to 1,275.67, 1,912.29 and 409.38 is: 613.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.67 : 1,912.29 = 409.38 : x
  2. Step 2: Convert to fraction form
    1,275.67/1,912.29 = 409.38/x
  3. Step 3: Cross multiply
    1,275.67x = 1,912.29 × 409.38
  4. Step 4: Simplify right side
    1,275.67x = 782,853.28
  5. Step 5: Solve for x
    x = 782,853.28/1,275.67
  6. Step 6: Final answer
    x = 613.68

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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.