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Finding the Fourth Proportional to 579.69, 869.54 and 214.43

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Solution

The fourth proportional to 579.69, 869.54 and 214.43 is: 321.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.69 : 869.54 = 214.43 : x
  2. Step 2: Convert to fraction form
    579.69/869.54 = 214.43/x
  3. Step 3: Cross multiply
    579.69x = 869.54 × 214.43
  4. Step 4: Simplify right side
    579.69x = 186,450.04
  5. Step 5: Solve for x
    x = 186,450.04/579.69
  6. Step 6: Final answer
    x = 321.64

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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.