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Finding the Fourth Proportional to 628.92, 939.70 and 511.88

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Solution

The fourth proportional to 628.92, 939.70 and 511.88 is: 764.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.92 : 939.70 = 511.88 : x
  2. Step 2: Convert to fraction form
    628.92/939.70 = 511.88/x
  3. Step 3: Cross multiply
    628.92x = 939.70 × 511.88
  4. Step 4: Simplify right side
    628.92x = 481,013.64
  5. Step 5: Solve for x
    x = 481,013.64/628.92
  6. Step 6: Final answer
    x = 764.82

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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.