Home / 21,121.84-31,680.28-5,540.68

Finding the Fourth Proportional to 21,121.84, 31,680.28 and 5,540.68

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Solution

The fourth proportional to 21,121.84, 31,680.28 and 5,540.68 is: 8,310.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.84 : 31,680.28 = 5,540.68 : x
  2. Step 2: Convert to fraction form
    21,121.84/31,680.28 = 5,540.68/x
  3. Step 3: Cross multiply
    21,121.84x = 31,680.28 × 5,540.68
  4. Step 4: Simplify right side
    21,121.84x = 175,530,293.79
  5. Step 5: Solve for x
    x = 175,530,293.79/21,121.84
  6. Step 6: Final answer
    x = 8,310.37

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1.5x scale

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.