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Finding the Fourth Proportional to 502.28, 693.21 and 305.79

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Solution

The fourth proportional to 502.28, 693.21 and 305.79 is: 422.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.28 : 693.21 = 305.79 : x
  2. Step 2: Convert to fraction form
    502.28/693.21 = 305.79/x
  3. Step 3: Cross multiply
    502.28x = 693.21 × 305.79
  4. Step 4: Simplify right side
    502.28x = 211,976.69
  5. Step 5: Solve for x
    x = 211,976.69/502.28
  6. Step 6: Final answer
    x = 422.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.