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Finding the Fourth Proportional to 402.75, 556.20 and 286.92

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Solution

The fourth proportional to 402.75, 556.20 and 286.92 is: 396.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.75 : 556.20 = 286.92 : x
  2. Step 2: Convert to fraction form
    402.75/556.20 = 286.92/x
  3. Step 3: Cross multiply
    402.75x = 556.20 × 286.92
  4. Step 4: Simplify right side
    402.75x = 159,584.90
  5. Step 5: Solve for x
    x = 159,584.90/402.75
  6. Step 6: Final answer
    x = 396.24

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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.