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Finding the Fourth Proportional to 409.71, 614.94 and 255.15

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Solution

The fourth proportional to 409.71, 614.94 and 255.15 is: 382.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.71 : 614.94 = 255.15 : x
  2. Step 2: Convert to fraction form
    409.71/614.94 = 255.15/x
  3. Step 3: Cross multiply
    409.71x = 614.94 × 255.15
  4. Step 4: Simplify right side
    409.71x = 156,901.94
  5. Step 5: Solve for x
    x = 156,901.94/409.71
  6. Step 6: Final answer
    x = 382.96

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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.