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Finding the Fourth Proportional to 859.35, 1,289.61 and 808.14

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Solution

The fourth proportional to 859.35, 1,289.61 and 808.14 is: 1,212.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.35 : 1,289.61 = 808.14 : x
  2. Step 2: Convert to fraction form
    859.35/1,289.61 = 808.14/x
  3. Step 3: Cross multiply
    859.35x = 1,289.61 × 808.14
  4. Step 4: Simplify right side
    859.35x = 1,042,185.43
  5. Step 5: Solve for x
    x = 1,042,185.43/859.35
  6. Step 6: Final answer
    x = 1,212.76

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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.