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Finding the Fourth Proportional to 1,015.85, 1,399.62 and 762.71

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Solution

The fourth proportional to 1,015.85, 1,399.62 and 762.71 is: 1,050.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.85 : 1,399.62 = 762.71 : x
  2. Step 2: Convert to fraction form
    1,015.85/1,399.62 = 762.71/x
  3. Step 3: Cross multiply
    1,015.85x = 1,399.62 × 762.71
  4. Step 4: Simplify right side
    1,015.85x = 1,067,504.17
  5. Step 5: Solve for x
    x = 1,067,504.17/1,015.85
  6. Step 6: Final answer
    x = 1,050.85

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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.