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Finding the Fourth Proportional to 1,285.75, 1,775.19 and 986.46

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Solution

The fourth proportional to 1,285.75, 1,775.19 and 986.46 is: 1,361.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.75 : 1,775.19 = 986.46 : x
  2. Step 2: Convert to fraction form
    1,285.75/1,775.19 = 986.46/x
  3. Step 3: Cross multiply
    1,285.75x = 1,775.19 × 986.46
  4. Step 4: Simplify right side
    1,285.75x = 1,751,153.93
  5. Step 5: Solve for x
    x = 1,751,153.93/1,285.75
  6. Step 6: Final answer
    x = 1,361.97

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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.