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Finding the Fourth Proportional to 859.19, 1,289.31 and 311.33

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Solution

The fourth proportional to 859.19, 1,289.31 and 311.33 is: 467.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.19 : 1,289.31 = 311.33 : x
  2. Step 2: Convert to fraction form
    859.19/1,289.31 = 311.33/x
  3. Step 3: Cross multiply
    859.19x = 1,289.31 × 311.33
  4. Step 4: Simplify right side
    859.19x = 401,394.44
  5. Step 5: Solve for x
    x = 401,394.44/859.19
  6. Step 6: Final answer
    x = 467.18

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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.