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Finding the Fourth Proportional to 579.64, 869.80 and 214.42

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Solution

The fourth proportional to 579.64, 869.80 and 214.42 is: 321.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.64 : 869.80 = 214.42 : x
  2. Step 2: Convert to fraction form
    579.64/869.80 = 214.42/x
  3. Step 3: Cross multiply
    579.64x = 869.80 × 214.42
  4. Step 4: Simplify right side
    579.64x = 186,502.52
  5. Step 5: Solve for x
    x = 186,502.52/579.64
  6. Step 6: Final answer
    x = 321.76

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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.