Home / 1,015.03-1,399.30-720.19

Finding the Fourth Proportional to 1,015.03, 1,399.30 and 720.19

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Solution

The fourth proportional to 1,015.03, 1,399.30 and 720.19 is: 992.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.03 : 1,399.30 = 720.19 : x
  2. Step 2: Convert to fraction form
    1,015.03/1,399.30 = 720.19/x
  3. Step 3: Cross multiply
    1,015.03x = 1,399.30 × 720.19
  4. Step 4: Simplify right side
    1,015.03x = 1,007,761.87
  5. Step 5: Solve for x
    x = 1,007,761.87/1,015.03
  6. Step 6: Final answer
    x = 992.84

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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.