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Finding the Fourth Proportional to 512.85, 707.81 and 326.55

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Solution

The fourth proportional to 512.85, 707.81 and 326.55 is: 450.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.85 : 707.81 = 326.55 : x
  2. Step 2: Convert to fraction form
    512.85/707.81 = 326.55/x
  3. Step 3: Cross multiply
    512.85x = 707.81 × 326.55
  4. Step 4: Simplify right side
    512.85x = 231,135.36
  5. Step 5: Solve for x
    x = 231,135.36/512.85
  6. Step 6: Final answer
    x = 450.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.