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Finding the Fourth Proportional to 521.28, 781.20 and 304.96

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Solution

The fourth proportional to 521.28, 781.20 and 304.96 is: 457.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.28 : 781.20 = 304.96 : x
  2. Step 2: Convert to fraction form
    521.28/781.20 = 304.96/x
  3. Step 3: Cross multiply
    521.28x = 781.20 × 304.96
  4. Step 4: Simplify right side
    521.28x = 238,234.75
  5. Step 5: Solve for x
    x = 238,234.75/521.28
  6. Step 6: Final answer
    x = 457.02

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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.