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Finding the Fourth Proportional to 521.89, 782.10 and 261.64

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Solution

The fourth proportional to 521.89, 782.10 and 261.64 is: 392.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.89 : 782.10 = 261.64 : x
  2. Step 2: Convert to fraction form
    521.89/782.10 = 261.64/x
  3. Step 3: Cross multiply
    521.89x = 782.10 × 261.64
  4. Step 4: Simplify right side
    521.89x = 204,628.64
  5. Step 5: Solve for x
    x = 204,628.64/521.89
  6. Step 6: Final answer
    x = 392.09

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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.