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Finding the Fourth Proportional to 515.17, 774.31 and 342.43

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Solution

The fourth proportional to 515.17, 774.31 and 342.43 is: 514.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.17 : 774.31 = 342.43 : x
  2. Step 2: Convert to fraction form
    515.17/774.31 = 342.43/x
  3. Step 3: Cross multiply
    515.17x = 774.31 × 342.43
  4. Step 4: Simplify right side
    515.17x = 265,146.97
  5. Step 5: Solve for x
    x = 265,146.97/515.17
  6. Step 6: Final answer
    x = 514.68

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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.