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Finding the Fourth Proportional to 983.01, 1,355.49 and 761.43

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Solution

The fourth proportional to 983.01, 1,355.49 and 761.43 is: 1,049.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.01 : 1,355.49 = 761.43 : x
  2. Step 2: Convert to fraction form
    983.01/1,355.49 = 761.43/x
  3. Step 3: Cross multiply
    983.01x = 1,355.49 × 761.43
  4. Step 4: Simplify right side
    983.01x = 1,032,110.75
  5. Step 5: Solve for x
    x = 1,032,110.75/983.01
  6. Step 6: Final answer
    x = 1,049.95

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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.