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Finding the Fourth Proportional to 431.27, 646.68 and 225.78

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Solution

The fourth proportional to 431.27, 646.68 and 225.78 is: 338.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.27 : 646.68 = 225.78 : x
  2. Step 2: Convert to fraction form
    431.27/646.68 = 225.78/x
  3. Step 3: Cross multiply
    431.27x = 646.68 × 225.78
  4. Step 4: Simplify right side
    431.27x = 146,007.41
  5. Step 5: Solve for x
    x = 146,007.41/431.27
  6. Step 6: Final answer
    x = 338.55

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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.