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Finding the Fourth Proportional to 1,275.92, 1,761 and 999.44

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Solution

The fourth proportional to 1,275.92, 1,761 and 999.44 is: 1,379.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.92 : 1,761 = 999.44 : x
  2. Step 2: Convert to fraction form
    1,275.92/1,761 = 999.44/x
  3. Step 3: Cross multiply
    1,275.92x = 1,761 × 999.44
  4. Step 4: Simplify right side
    1,275.92x = 1,760,013.84
  5. Step 5: Solve for x
    x = 1,760,013.84/1,275.92
  6. Step 6: Final answer
    x = 1,379.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.