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Finding the Fourth Proportional to 628.64, 938.73 and 513.31

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Solution

The fourth proportional to 628.64, 938.73 and 513.31 is: 766.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.64 : 938.73 = 513.31 : x
  2. Step 2: Convert to fraction form
    628.64/938.73 = 513.31/x
  3. Step 3: Cross multiply
    628.64x = 938.73 × 513.31
  4. Step 4: Simplify right side
    628.64x = 481,856.08
  5. Step 5: Solve for x
    x = 481,856.08/628.64
  6. Step 6: Final answer
    x = 766.51

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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.