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Finding the Fourth Proportional to 521.53, 782.78 and 326.92

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Solution

The fourth proportional to 521.53, 782.78 and 326.92 is: 490.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.53 : 782.78 = 326.92 : x
  2. Step 2: Convert to fraction form
    521.53/782.78 = 326.92/x
  3. Step 3: Cross multiply
    521.53x = 782.78 × 326.92
  4. Step 4: Simplify right side
    521.53x = 255,905.30
  5. Step 5: Solve for x
    x = 255,905.30/521.53
  6. Step 6: Final answer
    x = 490.68

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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.