Home / 20,871.20-28,802.19-11,311.37

Finding the Fourth Proportional to 20,871.20, 28,802.19 and 11,311.37

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Solution

The fourth proportional to 20,871.20, 28,802.19 and 11,311.37 is: 15,609.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.20 : 28,802.19 = 11,311.37 : x
  2. Step 2: Convert to fraction form
    20,871.20/28,802.19 = 11,311.37/x
  3. Step 3: Cross multiply
    20,871.20x = 28,802.19 × 11,311.37
  4. Step 4: Simplify right side
    20,871.20x = 325,792,083.89
  5. Step 5: Solve for x
    x = 325,792,083.89/20,871.20
  6. Step 6: Final answer
    x = 15,609.65

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1.5x scale

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.