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Finding the Fourth Proportional to 520.82, 782.04 and 423.45

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Solution

The fourth proportional to 520.82, 782.04 and 423.45 is: 635.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.82 : 782.04 = 423.45 : x
  2. Step 2: Convert to fraction form
    520.82/782.04 = 423.45/x
  3. Step 3: Cross multiply
    520.82x = 782.04 × 423.45
  4. Step 4: Simplify right side
    520.82x = 331,154.84
  5. Step 5: Solve for x
    x = 331,154.84/520.82
  6. Step 6: Final answer
    x = 635.83

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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.