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Finding the Fourth Proportional to 1,759.68, 2,640.42 and 785.57

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Solution

The fourth proportional to 1,759.68, 2,640.42 and 785.57 is: 1,178.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,759.68 : 2,640.42 = 785.57 : x
  2. Step 2: Convert to fraction form
    1,759.68/2,640.42 = 785.57/x
  3. Step 3: Cross multiply
    1,759.68x = 2,640.42 × 785.57
  4. Step 4: Simplify right side
    1,759.68x = 2,074,221.54
  5. Step 5: Solve for x
    x = 2,074,221.54/1,759.68
  6. Step 6: Final answer
    x = 1,178.75

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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.