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Finding the Fourth Proportional to 431.76, 646.44 and 225.88

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Solution

The fourth proportional to 431.76, 646.44 and 225.88 is: 338.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.76 : 646.44 = 225.88 : x
  2. Step 2: Convert to fraction form
    431.76/646.44 = 225.88/x
  3. Step 3: Cross multiply
    431.76x = 646.44 × 225.88
  4. Step 4: Simplify right side
    431.76x = 146,017.87
  5. Step 5: Solve for x
    x = 146,017.87/431.76
  6. Step 6: Final answer
    x = 338.19

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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.