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Finding the Fourth Proportional to 515.34, 711 and 308.34

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Solution

The fourth proportional to 515.34, 711 and 308.34 is: 425.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.34 : 711 = 308.34 : x
  2. Step 2: Convert to fraction form
    515.34/711 = 308.34/x
  3. Step 3: Cross multiply
    515.34x = 711 × 308.34
  4. Step 4: Simplify right side
    515.34x = 219,229.74
  5. Step 5: Solve for x
    x = 219,229.74/515.34
  6. Step 6: Final answer
    x = 425.41

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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.