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Finding the Fourth Proportional to 405.43, 559.94 and 274.21

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Solution

The fourth proportional to 405.43, 559.94 and 274.21 is: 378.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.43 : 559.94 = 274.21 : x
  2. Step 2: Convert to fraction form
    405.43/559.94 = 274.21/x
  3. Step 3: Cross multiply
    405.43x = 559.94 × 274.21
  4. Step 4: Simplify right side
    405.43x = 153,538.38
  5. Step 5: Solve for x
    x = 153,538.38/405.43
  6. Step 6: Final answer
    x = 378.71

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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.