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Finding the Fourth Proportional to 521.28, 782.41 and 326.67

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Solution

The fourth proportional to 521.28, 782.41 and 326.67 is: 490.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.28 : 782.41 = 326.67 : x
  2. Step 2: Convert to fraction form
    521.28/782.41 = 326.67/x
  3. Step 3: Cross multiply
    521.28x = 782.41 × 326.67
  4. Step 4: Simplify right side
    521.28x = 255,588.24
  5. Step 5: Solve for x
    x = 255,588.24/521.28
  6. Step 6: Final answer
    x = 490.31

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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.