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Finding the Fourth Proportional to 1,293.20, 1,939.44 and 634.76

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Solution

The fourth proportional to 1,293.20, 1,939.44 and 634.76 is: 951.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.20 : 1,939.44 = 634.76 : x
  2. Step 2: Convert to fraction form
    1,293.20/1,939.44 = 634.76/x
  3. Step 3: Cross multiply
    1,293.20x = 1,939.44 × 634.76
  4. Step 4: Simplify right side
    1,293.20x = 1,231,078.93
  5. Step 5: Solve for x
    x = 1,231,078.93/1,293.20
  6. Step 6: Final answer
    x = 951.96

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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.