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Finding the Fourth Proportional to 785.96, 1,084.48 and 449.87

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Solution

The fourth proportional to 785.96, 1,084.48 and 449.87 is: 620.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.96 : 1,084.48 = 449.87 : x
  2. Step 2: Convert to fraction form
    785.96/1,084.48 = 449.87/x
  3. Step 3: Cross multiply
    785.96x = 1,084.48 × 449.87
  4. Step 4: Simplify right side
    785.96x = 487,868.47
  5. Step 5: Solve for x
    x = 487,868.47/785.96
  6. Step 6: Final answer
    x = 620.73

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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.