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Finding the Fourth Proportional to 664.80, 917.64 and 443.80

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Solution

The fourth proportional to 664.80, 917.64 and 443.80 is: 612.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.80 : 917.64 = 443.80 : x
  2. Step 2: Convert to fraction form
    664.80/917.64 = 443.80/x
  3. Step 3: Cross multiply
    664.80x = 917.64 × 443.80
  4. Step 4: Simplify right side
    664.80x = 407,248.63
  5. Step 5: Solve for x
    x = 407,248.63/664.80
  6. Step 6: Final answer
    x = 612.59

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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.