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Finding the Fourth Proportional to 859.58, 1,289.12 and 311.61

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Solution

The fourth proportional to 859.58, 1,289.12 and 311.61 is: 467.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.58 : 1,289.12 = 311.61 : x
  2. Step 2: Convert to fraction form
    859.58/1,289.12 = 311.61/x
  3. Step 3: Cross multiply
    859.58x = 1,289.12 × 311.61
  4. Step 4: Simplify right side
    859.58x = 401,705.96
  5. Step 5: Solve for x
    x = 401,705.96/859.58
  6. Step 6: Final answer
    x = 467.33

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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.