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Finding the Fourth Proportional to 664.96, 917.68 and 385.24

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Solution

The fourth proportional to 664.96, 917.68 and 385.24 is: 531.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.96 : 917.68 = 385.24 : x
  2. Step 2: Convert to fraction form
    664.96/917.68 = 385.24/x
  3. Step 3: Cross multiply
    664.96x = 917.68 × 385.24
  4. Step 4: Simplify right side
    664.96x = 353,527.04
  5. Step 5: Solve for x
    x = 353,527.04/664.96
  6. Step 6: Final answer
    x = 531.65

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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.