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Finding the Fourth Proportional to 431.07, 646.61 and 225.70

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Solution

The fourth proportional to 431.07, 646.61 and 225.70 is: 338.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.07 : 646.61 = 225.70 : x
  2. Step 2: Convert to fraction form
    431.07/646.61 = 225.70/x
  3. Step 3: Cross multiply
    431.07x = 646.61 × 225.70
  4. Step 4: Simplify right side
    431.07x = 145,942.67
  5. Step 5: Solve for x
    x = 145,942.67/431.07
  6. Step 6: Final answer
    x = 338.56

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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.