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Finding the Fourth Proportional to 645.48, 967.24 and 428.28

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Solution

The fourth proportional to 645.48, 967.24 and 428.28 is: 641.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.48 : 967.24 = 428.28 : x
  2. Step 2: Convert to fraction form
    645.48/967.24 = 428.28/x
  3. Step 3: Cross multiply
    645.48x = 967.24 × 428.28
  4. Step 4: Simplify right side
    645.48x = 414,249.55
  5. Step 5: Solve for x
    x = 414,249.55/645.48
  6. Step 6: Final answer
    x = 641.77

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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.