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Finding the Fourth Proportional to 472.20, 707.94 and 423.96

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Solution

The fourth proportional to 472.20, 707.94 and 423.96 is: 635.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.20 : 707.94 = 423.96 : x
  2. Step 2: Convert to fraction form
    472.20/707.94 = 423.96/x
  3. Step 3: Cross multiply
    472.20x = 707.94 × 423.96
  4. Step 4: Simplify right side
    472.20x = 300,138.24
  5. Step 5: Solve for x
    x = 300,138.24/472.20
  6. Step 6: Final answer
    x = 635.62

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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.