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Finding the Fourth Proportional to 1,252.78, 1,729 and 728.86

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Solution

The fourth proportional to 1,252.78, 1,729 and 728.86 is: 1,005.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.78 : 1,729 = 728.86 : x
  2. Step 2: Convert to fraction form
    1,252.78/1,729 = 728.86/x
  3. Step 3: Cross multiply
    1,252.78x = 1,729 × 728.86
  4. Step 4: Simplify right side
    1,252.78x = 1,260,198.94
  5. Step 5: Solve for x
    x = 1,260,198.94/1,252.78
  6. Step 6: Final answer
    x = 1,005.92

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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.