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Finding the Fourth Proportional to 579.69, 868.79 and 405

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Solution

The fourth proportional to 579.69, 868.79 and 405 is: 606.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.69 : 868.79 = 405 : x
  2. Step 2: Convert to fraction form
    579.69/868.79 = 405/x
  3. Step 3: Cross multiply
    579.69x = 868.79 × 405
  4. Step 4: Simplify right side
    579.69x = 351,860.96
  5. Step 5: Solve for x
    x = 351,860.96/579.69
  6. Step 6: Final answer
    x = 606.98

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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.