Home / 20,870.97-31,293.27-11,517.51

Finding the Fourth Proportional to 20,870.97, 31,293.27 and 11,517.51

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Solution

The fourth proportional to 20,870.97, 31,293.27 and 11,517.51 is: 17,268.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.97 : 31,293.27 = 11,517.51 : x
  2. Step 2: Convert to fraction form
    20,870.97/31,293.27 = 11,517.51/x
  3. Step 3: Cross multiply
    20,870.97x = 31,293.27 × 11,517.51
  4. Step 4: Simplify right side
    20,870.97x = 360,420,550.16
  5. Step 5: Solve for x
    x = 360,420,550.16/20,870.97
  6. Step 6: Final answer
    x = 17,268.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.