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Finding the Fourth Proportional to 656.45, 905.87 and 361.72

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Solution

The fourth proportional to 656.45, 905.87 and 361.72 is: 499.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.45 : 905.87 = 361.72 : x
  2. Step 2: Convert to fraction form
    656.45/905.87 = 361.72/x
  3. Step 3: Cross multiply
    656.45x = 905.87 × 361.72
  4. Step 4: Simplify right side
    656.45x = 327,666.77
  5. Step 5: Solve for x
    x = 327,666.77/656.45
  6. Step 6: Final answer
    x = 499.15

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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.