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Finding the Fourth Proportional to 1,275.03, 1,912.87 and 409.34

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Solution

The fourth proportional to 1,275.03, 1,912.87 and 409.34 is: 614.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.03 : 1,912.87 = 409.34 : x
  2. Step 2: Convert to fraction form
    1,275.03/1,912.87 = 409.34/x
  3. Step 3: Cross multiply
    1,275.03x = 1,912.87 × 409.34
  4. Step 4: Simplify right side
    1,275.03x = 783,014.21
  5. Step 5: Solve for x
    x = 783,014.21/1,275.03
  6. Step 6: Final answer
    x = 614.11

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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.