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Finding the Fourth Proportional to 1,638.52, 2,455.79 and 759.83

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Solution

The fourth proportional to 1,638.52, 2,455.79 and 759.83 is: 1,138.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.52 : 2,455.79 = 759.83 : x
  2. Step 2: Convert to fraction form
    1,638.52/2,455.79 = 759.83/x
  3. Step 3: Cross multiply
    1,638.52x = 2,455.79 × 759.83
  4. Step 4: Simplify right side
    1,638.52x = 1,865,966.84
  5. Step 5: Solve for x
    x = 1,865,966.84/1,638.52
  6. Step 6: Final answer
    x = 1,138.81

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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.