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Finding the Fourth Proportional to 409.15, 612.78 and 226.18

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Solution

The fourth proportional to 409.15, 612.78 and 226.18 is: 338.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.15 : 612.78 = 226.18 : x
  2. Step 2: Convert to fraction form
    409.15/612.78 = 226.18/x
  3. Step 3: Cross multiply
    409.15x = 612.78 × 226.18
  4. Step 4: Simplify right side
    409.15x = 138,598.58
  5. Step 5: Solve for x
    x = 138,598.58/409.15
  6. Step 6: Final answer
    x = 338.75

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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.