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Finding the Fourth Proportional to 785.68, 1,083.78 and 490.44

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Solution

The fourth proportional to 785.68, 1,083.78 and 490.44 is: 676.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.68 : 1,083.78 = 490.44 : x
  2. Step 2: Convert to fraction form
    785.68/1,083.78 = 490.44/x
  3. Step 3: Cross multiply
    785.68x = 1,083.78 × 490.44
  4. Step 4: Simplify right side
    785.68x = 531,527.03
  5. Step 5: Solve for x
    x = 531,527.03/785.68
  6. Step 6: Final answer
    x = 676.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.