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Finding the Fourth Proportional to 645.39, 968.36 and 356.49

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Solution

The fourth proportional to 645.39, 968.36 and 356.49 is: 534.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.39 : 968.36 = 356.49 : x
  2. Step 2: Convert to fraction form
    645.39/968.36 = 356.49/x
  3. Step 3: Cross multiply
    645.39x = 968.36 × 356.49
  4. Step 4: Simplify right side
    645.39x = 345,208.87
  5. Step 5: Solve for x
    x = 345,208.87/645.39
  6. Step 6: Final answer
    x = 534.88

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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.