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Finding the Fourth Proportional to 816.83, 1,127.20 and 443.80

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Solution

The fourth proportional to 816.83, 1,127.20 and 443.80 is: 612.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.83 : 1,127.20 = 443.80 : x
  2. Step 2: Convert to fraction form
    816.83/1,127.20 = 443.80/x
  3. Step 3: Cross multiply
    816.83x = 1,127.20 × 443.80
  4. Step 4: Simplify right side
    816.83x = 500,251.36
  5. Step 5: Solve for x
    x = 500,251.36/816.83
  6. Step 6: Final answer
    x = 612.43

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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.