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Finding the Fourth Proportional to 786.56, 1,084.38 and 629.72

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Solution

The fourth proportional to 786.56, 1,084.38 and 629.72 is: 868.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.56 : 1,084.38 = 629.72 : x
  2. Step 2: Convert to fraction form
    786.56/1,084.38 = 629.72/x
  3. Step 3: Cross multiply
    786.56x = 1,084.38 × 629.72
  4. Step 4: Simplify right side
    786.56x = 682,855.77
  5. Step 5: Solve for x
    x = 682,855.77/786.56
  6. Step 6: Final answer
    x = 868.15

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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.