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Finding the Fourth Proportional to 286.92, 429.64 and 255.96

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Solution

The fourth proportional to 286.92, 429.64 and 255.96 is: 383.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.92 : 429.64 = 255.96 : x
  2. Step 2: Convert to fraction form
    286.92/429.64 = 255.96/x
  3. Step 3: Cross multiply
    286.92x = 429.64 × 255.96
  4. Step 4: Simplify right side
    286.92x = 109,970.65
  5. Step 5: Solve for x
    x = 109,970.65/286.92
  6. Step 6: Final answer
    x = 383.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.