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Finding the Fourth Proportional to 859.43, 1,289.49 and 311.65

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Solution

The fourth proportional to 859.43, 1,289.49 and 311.65 is: 467.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.43 : 1,289.49 = 311.65 : x
  2. Step 2: Convert to fraction form
    859.43/1,289.49 = 311.65/x
  3. Step 3: Cross multiply
    859.43x = 1,289.49 × 311.65
  4. Step 4: Simplify right side
    859.43x = 401,868.00
  5. Step 5: Solve for x
    x = 401,868.00/859.43
  6. Step 6: Final answer
    x = 467.60

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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.