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Finding the Fourth Proportional to 515.29, 711.11 and 308.25

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Solution

The fourth proportional to 515.29, 711.11 and 308.25 is: 425.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.29 : 711.11 = 308.25 : x
  2. Step 2: Convert to fraction form
    515.29/711.11 = 308.25/x
  3. Step 3: Cross multiply
    515.29x = 711.11 × 308.25
  4. Step 4: Simplify right side
    515.29x = 219,198.12
  5. Step 5: Solve for x
    x = 219,198.12/515.29
  6. Step 6: Final answer
    x = 425.39

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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.