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Finding the Fourth Proportional to 717.09, 1,076.40 and 409.56

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Solution

The fourth proportional to 717.09, 1,076.40 and 409.56 is: 614.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.09 : 1,076.40 = 409.56 : x
  2. Step 2: Convert to fraction form
    717.09/1,076.40 = 409.56/x
  3. Step 3: Cross multiply
    717.09x = 1,076.40 × 409.56
  4. Step 4: Simplify right side
    717.09x = 440,850.38
  5. Step 5: Solve for x
    x = 440,850.38/717.09
  6. Step 6: Final answer
    x = 614.78

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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.