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Finding the Fourth Proportional to 431.02, 645.67 and 225.28

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Solution

The fourth proportional to 431.02, 645.67 and 225.28 is: 337.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.02 : 645.67 = 225.28 : x
  2. Step 2: Convert to fraction form
    431.02/645.67 = 225.28/x
  3. Step 3: Cross multiply
    431.02x = 645.67 × 225.28
  4. Step 4: Simplify right side
    431.02x = 145,456.54
  5. Step 5: Solve for x
    x = 145,456.54/431.02
  6. Step 6: Final answer
    x = 337.47

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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.