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Finding the Fourth Proportional to 983.34, 1,481.64 and 813.78

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Solution

The fourth proportional to 983.34, 1,481.64 and 813.78 is: 1,226.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.34 : 1,481.64 = 813.78 : x
  2. Step 2: Convert to fraction form
    983.34/1,481.64 = 813.78/x
  3. Step 3: Cross multiply
    983.34x = 1,481.64 × 813.78
  4. Step 4: Simplify right side
    983.34x = 1,205,729.00
  5. Step 5: Solve for x
    x = 1,205,729.00/983.34
  6. Step 6: Final answer
    x = 1,226.16

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.