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Finding the Fourth Proportional to 408.34, 612.56 and 286.23

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Solution

The fourth proportional to 408.34, 612.56 and 286.23 is: 429.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.34 : 612.56 = 286.23 : x
  2. Step 2: Convert to fraction form
    408.34/612.56 = 286.23/x
  3. Step 3: Cross multiply
    408.34x = 612.56 × 286.23
  4. Step 4: Simplify right side
    408.34x = 175,336.06
  5. Step 5: Solve for x
    x = 175,336.06/408.34
  6. Step 6: Final answer
    x = 429.39

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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.