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Finding the Fourth Proportional to 286.53, 394.40 and 256.92

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Solution

The fourth proportional to 286.53, 394.40 and 256.92 is: 353.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.53 : 394.40 = 256.92 : x
  2. Step 2: Convert to fraction form
    286.53/394.40 = 256.92/x
  3. Step 3: Cross multiply
    286.53x = 394.40 × 256.92
  4. Step 4: Simplify right side
    286.53x = 101,327.96
  5. Step 5: Solve for x
    x = 101,327.96/286.53
  6. Step 6: Final answer
    x = 353.64

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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.