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Finding the Fourth Proportional to 664.66, 997.16 and 253.57

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Solution

The fourth proportional to 664.66, 997.16 and 253.57 is: 380.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.66 : 997.16 = 253.57 : x
  2. Step 2: Convert to fraction form
    664.66/997.16 = 253.57/x
  3. Step 3: Cross multiply
    664.66x = 997.16 × 253.57
  4. Step 4: Simplify right side
    664.66x = 252,849.86
  5. Step 5: Solve for x
    x = 252,849.86/664.66
  6. Step 6: Final answer
    x = 380.42

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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.