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Finding the Fourth Proportional to 859.38, 1,289.43 and 617.82

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Solution

The fourth proportional to 859.38, 1,289.43 and 617.82 is: 926.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.38 : 1,289.43 = 617.82 : x
  2. Step 2: Convert to fraction form
    859.38/1,289.43 = 617.82/x
  3. Step 3: Cross multiply
    859.38x = 1,289.43 × 617.82
  4. Step 4: Simplify right side
    859.38x = 796,635.64
  5. Step 5: Solve for x
    x = 796,635.64/859.38
  6. Step 6: Final answer
    x = 926.99

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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.