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Finding the Fourth Proportional to 426.75, 640.26 and 311.00

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Solution

The fourth proportional to 426.75, 640.26 and 311.00 is: 466.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.75 : 640.26 = 311.00 : x
  2. Step 2: Convert to fraction form
    426.75/640.26 = 311.00/x
  3. Step 3: Cross multiply
    426.75x = 640.26 × 311.00
  4. Step 4: Simplify right side
    426.75x = 199,117.66
  5. Step 5: Solve for x
    x = 199,117.66/426.75
  6. Step 6: Final answer
    x = 466.59

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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.