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Finding the Fourth Proportional to 656.40, 905.79 and 361.71

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Solution

The fourth proportional to 656.40, 905.79 and 361.71 is: 499.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.40 : 905.79 = 361.71 : x
  2. Step 2: Convert to fraction form
    656.40/905.79 = 361.71/x
  3. Step 3: Cross multiply
    656.40x = 905.79 × 361.71
  4. Step 4: Simplify right side
    656.40x = 327,633.30
  5. Step 5: Solve for x
    x = 327,633.30/656.40
  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.