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Finding the Fourth Proportional to 628.17, 938.33 and 518.82

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Solution

The fourth proportional to 628.17, 938.33 and 518.82 is: 774.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.17 : 938.33 = 518.82 : x
  2. Step 2: Convert to fraction form
    628.17/938.33 = 518.82/x
  3. Step 3: Cross multiply
    628.17x = 938.33 × 518.82
  4. Step 4: Simplify right side
    628.17x = 486,821.78
  5. Step 5: Solve for x
    x = 486,821.78/628.17
  6. Step 6: Final answer
    x = 774.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.