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Finding the Fourth Proportional to 1,015.27, 1,399.32 and 775.90

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Solution

The fourth proportional to 1,015.27, 1,399.32 and 775.90 is: 1,069.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.27 : 1,399.32 = 775.90 : x
  2. Step 2: Convert to fraction form
    1,015.27/1,399.32 = 775.90/x
  3. Step 3: Cross multiply
    1,015.27x = 1,399.32 × 775.90
  4. Step 4: Simplify right side
    1,015.27x = 1,085,732.39
  5. Step 5: Solve for x
    x = 1,085,732.39/1,015.27
  6. Step 6: Final answer
    x = 1,069.40

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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.