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Finding the Fourth Proportional to 664.54, 917.39 and 454.78

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Solution

The fourth proportional to 664.54, 917.39 and 454.78 is: 627.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.54 : 917.39 = 454.78 : x
  2. Step 2: Convert to fraction form
    664.54/917.39 = 454.78/x
  3. Step 3: Cross multiply
    664.54x = 917.39 × 454.78
  4. Step 4: Simplify right side
    664.54x = 417,212.91
  5. Step 5: Solve for x
    x = 417,212.91/664.54
  6. Step 6: Final answer
    x = 627.82

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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.