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Finding the Fourth Proportional to 719.27, 1,078.38 and 353.78

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Solution

The fourth proportional to 719.27, 1,078.38 and 353.78 is: 530.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.27 : 1,078.38 = 353.78 : x
  2. Step 2: Convert to fraction form
    719.27/1,078.38 = 353.78/x
  3. Step 3: Cross multiply
    719.27x = 1,078.38 × 353.78
  4. Step 4: Simplify right side
    719.27x = 381,503.88
  5. Step 5: Solve for x
    x = 381,503.88/719.27
  6. Step 6: Final answer
    x = 530.41

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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.