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Finding the Fourth Proportional to 656.43, 905.86 and 361.70

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Solution

The fourth proportional to 656.43, 905.86 and 361.70 is: 499.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.43 : 905.86 = 361.70 : x
  2. Step 2: Convert to fraction form
    656.43/905.86 = 361.70/x
  3. Step 3: Cross multiply
    656.43x = 905.86 × 361.70
  4. Step 4: Simplify right side
    656.43x = 327,649.56
  5. Step 5: Solve for x
    x = 327,649.56/656.43
  6. Step 6: Final answer
    x = 499.14

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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.