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Finding the Fourth Proportional to 1,083.80, 1,628.10 and 759.80

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Solution

The fourth proportional to 1,083.80, 1,628.10 and 759.80 is: 1,141.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.80 : 1,628.10 = 759.80 : x
  2. Step 2: Convert to fraction form
    1,083.80/1,628.10 = 759.80/x
  3. Step 3: Cross multiply
    1,083.80x = 1,628.10 × 759.80
  4. Step 4: Simplify right side
    1,083.80x = 1,237,030.38
  5. Step 5: Solve for x
    x = 1,237,030.38/1,083.80
  6. Step 6: Final answer
    x = 1,141.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.