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Finding the Fourth Proportional to 1,274.79, 1,912.50 and 409.11

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Solution

The fourth proportional to 1,274.79, 1,912.50 and 409.11 is: 613.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.79 : 1,912.50 = 409.11 : x
  2. Step 2: Convert to fraction form
    1,274.79/1,912.50 = 409.11/x
  3. Step 3: Cross multiply
    1,274.79x = 1,912.50 × 409.11
  4. Step 4: Simplify right side
    1,274.79x = 782,422.88
  5. Step 5: Solve for x
    x = 782,422.88/1,274.79
  6. Step 6: Final answer
    x = 613.77

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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.