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Finding the Fourth Proportional to 408.94, 614.76 and 378.87

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Solution

The fourth proportional to 408.94, 614.76 and 378.87 is: 569.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.94 : 614.76 = 378.87 : x
  2. Step 2: Convert to fraction form
    408.94/614.76 = 378.87/x
  3. Step 3: Cross multiply
    408.94x = 614.76 × 378.87
  4. Step 4: Simplify right side
    408.94x = 232,910.40
  5. Step 5: Solve for x
    x = 232,910.40/408.94
  6. Step 6: Final answer
    x = 569.55

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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.