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Finding the Fourth Proportional to 1,759.73, 2,640.47 and 785.57

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Solution

The fourth proportional to 1,759.73, 2,640.47 and 785.57 is: 1,178.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,759.73 : 2,640.47 = 785.57 : x
  2. Step 2: Convert to fraction form
    1,759.73/2,640.47 = 785.57/x
  3. Step 3: Cross multiply
    1,759.73x = 2,640.47 × 785.57
  4. Step 4: Simplify right side
    1,759.73x = 2,074,256.89
  5. Step 5: Solve for x
    x = 2,074,256.89/1,759.73
  6. Step 6: Final answer
    x = 1,178.74

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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.