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Finding the Fourth Proportional to 289.56, 431.87 and 254.92

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Solution

The fourth proportional to 289.56, 431.87 and 254.92 is: 380.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.56 : 431.87 = 254.92 : x
  2. Step 2: Convert to fraction form
    289.56/431.87 = 254.92/x
  3. Step 3: Cross multiply
    289.56x = 431.87 × 254.92
  4. Step 4: Simplify right side
    289.56x = 110,092.30
  5. Step 5: Solve for x
    x = 110,092.30/289.56
  6. Step 6: Final answer
    x = 380.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.