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Finding the Fourth Proportional to 1,539.78, 2,309.88 and 759.83

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Solution

The fourth proportional to 1,539.78, 2,309.88 and 759.83 is: 1,139.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.78 : 2,309.88 = 759.83 : x
  2. Step 2: Convert to fraction form
    1,539.78/2,309.88 = 759.83/x
  3. Step 3: Cross multiply
    1,539.78x = 2,309.88 × 759.83
  4. Step 4: Simplify right side
    1,539.78x = 1,755,104.57
  5. Step 5: Solve for x
    x = 1,755,104.57/1,539.78
  6. Step 6: Final answer
    x = 1,139.84

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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.