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Finding the Fourth Proportional to 512.20, 706.62 and 423.64

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Solution

The fourth proportional to 512.20, 706.62 and 423.64 is: 584.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.20 : 706.62 = 423.64 : x
  2. Step 2: Convert to fraction form
    512.20/706.62 = 423.64/x
  3. Step 3: Cross multiply
    512.20x = 706.62 × 423.64
  4. Step 4: Simplify right side
    512.20x = 299,352.50
  5. Step 5: Solve for x
    x = 299,352.50/512.20
  6. Step 6: Final answer
    x = 584.44

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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.