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Finding the Fourth Proportional to 843.60, 1,259.02 and 821.73

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Solution

The fourth proportional to 843.60, 1,259.02 and 821.73 is: 1,226.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.60 : 1,259.02 = 821.73 : x
  2. Step 2: Convert to fraction form
    843.60/1,259.02 = 821.73/x
  3. Step 3: Cross multiply
    843.60x = 1,259.02 × 821.73
  4. Step 4: Simplify right side
    843.60x = 1,034,574.50
  5. Step 5: Solve for x
    x = 1,034,574.50/843.60
  6. Step 6: Final answer
    x = 1,226.38

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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.