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Finding the Fourth Proportional to 515.91, 712.04 and 306.15

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Solution

The fourth proportional to 515.91, 712.04 and 306.15 is: 422.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.91 : 712.04 = 306.15 : x
  2. Step 2: Convert to fraction form
    515.91/712.04 = 306.15/x
  3. Step 3: Cross multiply
    515.91x = 712.04 × 306.15
  4. Step 4: Simplify right side
    515.91x = 217,991.05
  5. Step 5: Solve for x
    x = 217,991.05/515.91
  6. Step 6: Final answer
    x = 422.54

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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.