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Finding the Fourth Proportional to 521.29, 782.22 and 213.07

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Solution

The fourth proportional to 521.29, 782.22 and 213.07 is: 319.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.29 : 782.22 = 213.07 : x
  2. Step 2: Convert to fraction form
    521.29/782.22 = 213.07/x
  3. Step 3: Cross multiply
    521.29x = 782.22 × 213.07
  4. Step 4: Simplify right side
    521.29x = 166,667.62
  5. Step 5: Solve for x
    x = 166,667.62/521.29
  6. Step 6: Final answer
    x = 319.72

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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.