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Finding the Fourth Proportional to 408.39, 612.05 and 253.95

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Solution

The fourth proportional to 408.39, 612.05 and 253.95 is: 380.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.39 : 612.05 = 253.95 : x
  2. Step 2: Convert to fraction form
    408.39/612.05 = 253.95/x
  3. Step 3: Cross multiply
    408.39x = 612.05 × 253.95
  4. Step 4: Simplify right side
    408.39x = 155,428.83
  5. Step 5: Solve for x
    x = 155,428.83/408.39
  6. Step 6: Final answer
    x = 380.59

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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.