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Finding the Fourth Proportional to 664.43, 917.32 and 428.49

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Solution

The fourth proportional to 664.43, 917.32 and 428.49 is: 591.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.43 : 917.32 = 428.49 : x
  2. Step 2: Convert to fraction form
    664.43/917.32 = 428.49/x
  3. Step 3: Cross multiply
    664.43x = 917.32 × 428.49
  4. Step 4: Simplify right side
    664.43x = 393,062.45
  5. Step 5: Solve for x
    x = 393,062.45/664.43
  6. Step 6: Final answer
    x = 591.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.