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Finding the Fourth Proportional to 859.05, 1,288.75 and 281.88

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Solution

The fourth proportional to 859.05, 1,288.75 and 281.88 is: 422.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.05 : 1,288.75 = 281.88 : x
  2. Step 2: Convert to fraction form
    859.05/1,288.75 = 281.88/x
  3. Step 3: Cross multiply
    859.05x = 1,288.75 × 281.88
  4. Step 4: Simplify right side
    859.05x = 363,272.85
  5. Step 5: Solve for x
    x = 363,272.85/859.05
  6. Step 6: Final answer
    x = 422.88

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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.