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Finding the Fourth Proportional to 287.81, 396.86 and 250.86

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Solution

The fourth proportional to 287.81, 396.86 and 250.86 is: 345.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.81 : 396.86 = 250.86 : x
  2. Step 2: Convert to fraction form
    287.81/396.86 = 250.86/x
  3. Step 3: Cross multiply
    287.81x = 396.86 × 250.86
  4. Step 4: Simplify right side
    287.81x = 99,555.05
  5. Step 5: Solve for x
    x = 99,555.05/287.81
  6. Step 6: Final answer
    x = 345.91

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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.