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Finding the Fourth Proportional to 521.51, 782.12 and 213.44

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Solution

The fourth proportional to 521.51, 782.12 and 213.44 is: 320.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.51 : 782.12 = 213.44 : x
  2. Step 2: Convert to fraction form
    521.51/782.12 = 213.44/x
  3. Step 3: Cross multiply
    521.51x = 782.12 × 213.44
  4. Step 4: Simplify right side
    521.51x = 166,930.72
  5. Step 5: Solve for x
    x = 166,930.72/521.51
  6. Step 6: Final answer
    x = 320.09

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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.