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Finding the Fourth Proportional to 843.69, 1,259.43 and 728.87

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Solution

The fourth proportional to 843.69, 1,259.43 and 728.87 is: 1,088.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.69 : 1,259.43 = 728.87 : x
  2. Step 2: Convert to fraction form
    843.69/1,259.43 = 728.87/x
  3. Step 3: Cross multiply
    843.69x = 1,259.43 × 728.87
  4. Step 4: Simplify right side
    843.69x = 917,956.44
  5. Step 5: Solve for x
    x = 917,956.44/843.69
  6. Step 6: Final answer
    x = 1,088.03

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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.